If you’re staring at a sudden post-migration traffic collapse, you don’t need theory—you need a clock-driven protocol that gets you from panic to proof, then from proof to fixes (or rollback) in the first 72 hours. This guide gives you a migration-specific crisis framework: what to check first, how to read Google Search Console (GSC) failure signatures, and how to decide undo vs. push-forward fast—without guessing.

Overview: Why migration traffic collapses are different (and why 72 hours matters)

A domain migration or site merge is one of the few SEO events where you can directly break Google’s ability to crawl, index, and trust your pages overnight. Unlike algorithm volatility, a domain migration traffic drop usually has identifiable mechanical causes: redirects that don’t resolve cleanly, robots blocks, canonical conflicts, sitemap mismatches, server instability, and analytics misconfiguration that makes the crash look worse (or hides it). Google’s own site-move documentation stresses consistency of signals—redirects, canonicals, sitemaps, and internal linking—because that’s how consolidation happens after a move [1].

The first 72 hours matter because this is when Googlebot is most actively testing old and new URLs, and when your team still has maximum ability to reverse risky changes (DNS/edge rules, robots directives, CMS templates, and redirect logic). If you wait a week, you often end up with a longer, more expensive domain migration disaster recovery: Google may have partially reprocessed mixed signals; stakeholders may have launched campaigns pointing at the new domain; and engineering may have moved on.

This protocol is built for marketing leaders who must coordinate SEO, engineering, analytics, and exec stakeholders under pressure. You’ll get:

• A time-boxed diagnostic sequence for the first 72 hours (not a generic checklist).
• A hard “undo vs. push-forward” decision matrix so you stop debating and start executing.
• The most common “fix broken website migration” patterns and how they surface in GSC.
• Realistic recovery expectations grounded in public case studies and Google guidance [1].
• Communication templates to control narrative and prevent internal churn.

Actionable takeaway: Treat the first 72 hours like an incident response. Your goal is not “find every issue.” Your goal is to restore crawl/index signal integrity and make one irreversible decision—rollback or fix-forward—based on evidence.

1) Emergency Diagnostic Checklist (First 72 Hours)

You’re trying to answer three questions quickly: Is the drop real? Is Google blocked or misdirected? Are signals consistent enough to recover without rollback? Run the triage in this order.

Hour 0–2: Start an incident channel and freeze risky deployments

Create a dedicated “red-team” Slack/Teams channel with an SEO lead, analytics engineer, dev-ops, CMS owner, and hosting/CDN partner. Pull your pre-migration artifacts (redirects.csv, robots.txt, sitemap.xml, GA4 settings) into one shared folder so nobody debates which version is “correct” later. This aligns with migration war-room best practice embedded in technical migration playbooks [1].

Hour 2–12: Prove (or falsify) a tracking-only crash

Before you declare a post-migration traffic collapse, validate GA4 and tagging: check GA4 source/medium trends, verify cross-domain measurement and referral exclusions, and use GA debug views if needed. Attribution and “Unassigned/Not set” issues can create false alarms or misclassify organic as referral/direct after a domain change [16], [19].
Example: A marketing manager on a public GA forum thread described “organic disappeared” after a domain change; the root cause was cross-domain and referral exclusion misconfiguration, not ranking loss [16].
Takeaway: If Search Console clicks/impressions are stable but GA4 organic is down, treat it as analytics until proven otherwise.

Hour 12–36: GSC triage—coverage, inspection, and move signals

In GSC, check:

• Pages / Coverage: Errors + “Valid with warnings.” Look specifically for spikes in 404, redirect errors, blocked by robots.txt, and “Indexed, though blocked” patterns [51].
• URL Inspection (live test): Test your homepage, top category templates, and top blog templates. Record: HTTP status, rendered canonical, and whether Google can fetch resources.
• Manual Actions / Security: Confirm nothing surfaced after launch (rare, but you must rule it out) [1].
• Index snapshot: Export indexed counts and compare to baseline. Google’s guidance emphasizes monitoring indexing and crawling post-move [1].

Example: A TechSEO Reddit thread described a “98% drop” after a domain migration where GSC showed large-scale redirect issues and excluded pages—symptoms of a mechanical migration failure, not “Google hates the rebrand” [8].
Takeaway: GSC is your source of truth for whether Google is failing to crawl/index vs. simply re-ranking.

Hour 36–60: Redirect integrity audit (you want ≥95% single-hop)

Run a redirect validation against your redirects.csv using a crawler in list mode and flag:

• Non-301/308 responses
• Redirect chains (>1 hop)
• Redirect loops
• Redirects that land on 404s or irrelevant pages
• Protocol/casing inconsistencies (http→https→www→non-www chains)

Screaming Frog documents why redirect chains waste crawl budget and slow signal consolidation [11], [13]. The practical KPI: ≥95% of legacy URLs should resolve to the correct destination in a single hop (analysis—use as an operational target).
Example: The Wiggle migration (UK → .com) saw severe visibility loss tied to incorrect or missing redirects, reported in industry analysis [26].
Takeaway: If you’re trying to recover from failed migration, redirect completeness is your fastest lever.

Hour 60–72: Robots, canonicals, sitemaps, logs, and server health

Run these checks in parallel:

• Robots gates: Fetch /robots.txt live. Confirm it returns 200 quickly and does not include Disallow: /. Robots misfires are a classic migration killer, and case studies show massive reversals once corrected [21].
• Canonical + hreflang: Verify each template’s canonical points to the new URL and not the old domain.
• XML sitemap: Generate a clean sitemap of new domain URLs only, submit in GSC, and re-ping as needed [35], [37].
• Server logs: Sample access logs and count Googlebot hits on old URLs that return 404/200 (wrong) and any 5xx spikes. Log monitoring is widely recommended for migration debugging because it reveals what Googlebot is actually experiencing [40], [45].
• Core Web Vitals regressions: If performance cratered during migration, it can compound ranking instability. Monitor LCP/INP/CLS trends and fix obvious regressions [32], [62].

Example: Firebrand’s Planful case study shows impressions and clicks surged after correcting a robots.txt block—an archetypal “we accidentally shut the doors” migration issue [21].
Takeaway: In the first 72 hours, your job is to remove crawl/index blockers and stop bleeding authority through broken redirects and conflicting signals.

2) The Undo vs. Push Forward Framework

When a website merge destroyed rankings or your new domain launches and traffic collapses, the most expensive mistake is indecision. Google can process a rollback, but delays extend consolidation time; industry commentary referencing Google’s guidance highlights that reverting quickly is key if you choose to reverse [1], [1]. Your decision should be evidence-based, weighted, and made within a defined window (often 24–72 hours depending on business risk).

The decision principle: pick the path with the highest probability of restoring signal integrity fastest

You’re deciding between:

• UNDO (Rollback): Repoint to old domain (or restore old URLs), then redirect new→old consistently.
• PUSH FORWARD (Fix-forward): Keep the new domain live and rapidly fix redirects, canonicals, robots, sitemaps, internal links, and infrastructure until Google consolidates.

Google’s site-move documentation explicitly allows and describes reversing a move (operationally: redirect everything back and keep signals consistent) [1]. Search industry summaries of Google commentary also reinforce that fast reversal limits reprocessing pain (analysis supported by reversal guidance coverage) [1], [1].

Undo vs. Push-forward decision matrix (weighted scoring)

Score each factor 1–5 (5 = favorable for push-forward). Multiply by weight.

Decision rule (operational):

• If your weighted score is ≥3.5/5, push-forward.
• If <3.5/5 or you hit “red-line” triggers, rollback.

Red-line triggers (rollback strongly favored)

Rollback if 3+ of these are true (analysis, but grounded in migration failure patterns):

• 5% of top legacy URLs lack correct redirects (or redirect to irrelevant targets).

• Robots.txt or meta noindex accidentally blocks key templates (confirmed via live tests) [21].
• Server instability: sustained 5xx spikes during Googlebot crawl bursts (validate in logs) [40].
• Canonicals still point to old domain across templates.
• Engineering cannot ship fixes within 48–72 hours.

Real-world patterns (mini-cases)

• Fix-forward win: OutdoorToys recovered visibility over several months after a move, consistent with a disciplined fix-forward approach where redirects and signals were corrected and maintained [6].
• Rollback rationale: WooCommerce documented returning to WooCommerce.com after a domain change—showing that reverting is sometimes the rational path when brand and performance goals aren’t met (useful precedent for stakeholder confidence) [59], [60].
• “Merge gone wrong” scenario: In multiple public forum threads, marketers describe merges where category-level redirect logic was incomplete, leading to widespread “soft 404” outcomes and long recovery tails [8], [10].

Actionable takeaway: Make the call by Day 3. Every extra day of mixed signals increases the time Google needs to reconcile your entity, URLs, and content clusters.

3) Common Migration Mistakes & Their GSC Signatures

When you need to fix broken website migration issues quickly, it helps to pattern-match. Most domain-change and merge disasters fall into a handful of failure modes—and GSC tells you which one you’re in.

Mistake #1: Missing or incorrect redirects (the #1 cause of domain migration traffic drop)

Signature in GSC: Coverage shows rising “Not found (404)” for legacy URLs, plus “Page with redirect” anomalies and sharp drops in indexed pages. You’ll also see old URLs still being crawled in logs but returning 404 or (worse) 200 with thin/placeholder pages. Redirect guidance and auditing methods emphasize eliminating chains and ensuring correct status codes [13], [15].
Example: Wiggle’s reported visibility collapse is widely attributed to redirect problems during the move (incorrect mapping at scale) [26].
Takeaway: Map old→new one-to-one where possible; avoid “everything to homepage.”

Mistake #2: Redirect chains and loops (Googlebot gets stuck)

Signature in tools: Crawl reports show multiple hops (A→B→C) and occasional loops. In GSC, redirect errors can appear when Google can’t resolve cleanly. Screaming Frog explicitly flags redirect chains as an issue because they dilute efficiency and delay consolidation [11].
Example: A developer forum post about migration troubleshooting described edge-rule conflicts creating http→https→www→non-www chains—fixing the order removed chains and indexing stabilized (analysis consistent with chain mechanics) [11], [13].
Takeaway: Single-hop redirects are your emergency standard.

Mistake #3: Robots.txt or template noindex blocks (you locked Google out)

Signature in GSC: “Blocked by robots.txt,” “Indexed, though blocked by robots.txt,” or sudden index drops after deploy [21], [22].
Example: Planful’s case study shows how a robots.txt block suppressed visibility; once removed, impressions climbed dramatically [21].
Takeaway: Check robots and meta robots on your top templates within the first hour of triage.

Mistake #4: Canonical conflicts (you told Google the wrong URL is “primary”)

Signature in GSC: “Duplicate without user-selected canonical,” “Alternate page with proper canonical,” or pages excluded unexpectedly. Live URL Inspection reveals canonicals pointing to the old domain or to parameterized variants. Google’s migration docs stress consistent canonical and internal-link signals for consolidation [1].
Example: In site-merge threads, a common failure is leaving old canonicals on merged content so Google keeps treating the old domain as the canonical entity, slowing transfer (analysis supported by canonical fundamentals in Google docs) [1].
Takeaway: Canonicals must align with redirects and internal linking—no exceptions.

Mistake #5: Sitemap mismatch (you’re feeding Google outdated URLs)

Signature in GSC: Sitemap submitted but shows many discovered URLs that don’t match the new domain, or indexing progress stalls. Community and support threads highlight that sitemap submission issues often trace back to hosting location, mixed-domain entries, or incorrect responses [35], [38].
Takeaway: Submit a clean new-domain sitemap; keep old sitemap accessible temporarily if needed, but don’t mix domains in one file.

Mistake #6: Infrastructure/performance regression (you made the site slower or unstable)

Signature: Logs show 5xx spikes; GSC Crawl stats may show reduced crawl; Core Web Vitals shift red post-launch [32], [62].
Example: Performance-focused migration case studies show that improving CWV can boost conversions; the inverse is also true—regressions can amplify ranking volatility during consolidation [65].
Takeaway: Stability first. Fix 5xx and TTFB before polishing content.

Actionable takeaway: Use “signature → fix” mapping. Don’t run 50 audits. Run the 5 checks that correspond to the signature you see in GSC and logs.

4) Traffic Recovery Timeline Expectations (Realistic, migration-specific)

Your stakeholders will ask two questions immediately: “How long will this last?” and “Will we recover?” Your job is to set expectations grounded in how Google reprocesses moves: crawling old URLs, following redirects, re-indexing new URLs, and consolidating signals over time [1].

What “normal” looks like after a clean move

Even well-executed migrations often see volatility. Industry guidance and migration case studies commonly show multi-week stabilization, with many sites seeing meaningful recovery in the 8–12 week range when redirects and signals are consistent (analysis supported by common recovery curves discussed in migration guides) [1], [80]. For larger sites or complex merges, it can stretch longer.

What “abnormal” looks like (and why it takes longer)

If your website merge destroyed rankings because category templates broke, canonicals conflict, or robots blocks exist, you aren’t “waiting for Google.” You’re forcing Google to repeatedly crawl error states. That adds weeks.

• Redirects wrong at scale: Expect a longer tail; Google must discover fixes, recrawl old URLs, and trust the new mapping.
• Robots/noindex present: Recovery can be dramatic once removed, but only after recrawl and reindex [21], [22].
• Two domains serving 200s for same content: Canonical confusion delays consolidation—recovery becomes nonlinear.

Benchmarks from public cases (useful for exec expectations)

• OutdoorToys publicly reported full visibility recovery in roughly 4 months after migration work, showing that even successful recoveries can exceed 90 days depending on scale and starting state [6].
• Planful’s robots.txt fix produced very large impression growth after removing the block—illustrating how “mechanical” fixes can unlock rapid improvement once Google can crawl again [21].
• High-profile visibility-loss examples tied to redirects show that when mapping is wrong, visibility can drop >90% and stay depressed until redirect integrity is restored [26].

A practical 30/60/90 recovery forecast you can brief

Use this timeline model (analysis, designed for stakeholder clarity):

Day 0–3 (stabilize): stop blockers (robots/noindex/5xx), reach ≥95% redirect integrity, submit sitemap, validate canonicals.
Day 4–14 (re-crawl): GSC errors should trend down; indexed pages on new domain begin rising; long-tail pages fluctuate.
Day 15–45 (consolidation): rankings begin reappearing for head terms; branded queries stabilize first; non-brand follows.
Day 46–90 (normalization): most sections recover if mapping is correct; remaining gaps often tie to missed redirects, orphaned pages, or template canonical bugs.

Actionable takeaway: Don’t promise “back next week.” Promise a staged recovery with weekly leading indicators: redirect integrity %, GSC error counts, indexed URLs, and Googlebot 200/301 ratios from logs.

5) Stakeholder Communication During Crisis (Templates you can use today)

When you’re trying to recover from failed migration, your communication plan is as important as your technical plan. Without it, you’ll get thrash: execs demanding channel shifts, product teams pushing new releases, and engineers “fixing” the wrong thing.

The crisis-communication rules (migration-specific)

1. Name the incident precisely: “Domain migration indexing/redirect integrity incident,” not “SEO drop.” This keeps it migration-scoped, not algorithm-scoped.
2. Separate measurement from reality: report GSC clicks/impressions and GA4 sessions separately until tracking is validated [16].
3. Publish a 72-hour plan with owners: what you’ll check, what “done” means, and when the next update lands.
4. Give an undo/push-forward decision time: executives relax when they know there’s a decision gate.

A simple stakeholder update cadence (recommended)

• Update #1 (within 4 hours): confirm incident, immediate containment, what data you’re validating.
• Update #2 (within 24 hours): first evidence set (GSC errors, redirect audit summary, robots status).
• Update #3 (at 48–72 hours): decision point + recovery timeline forecast.

Sample executive-brief email (copy/paste)

Subject: Domain migration traffic incident — 72-hour recovery plan + rollback decision gate

Hi team,
We’re seeing a significant organic decline immediately following the domain migration. This is a migration-specific indexing/redirect integrity incident (not an algorithm event).

What we’ve confirmed so far (as of [time]):

• GSC: [Clicks/Impressions trend], with key error signals: [e.g., 404 spike / redirect errors / blocked by robots]
• Analytics: GA4 organic sessions show [trend]; cross-domain attribution is being validated in parallel [16]
• Redirect integrity: [X%] of legacy URLs resolve via single-hop 301/308; [Y] critical templates failing (chains/loops/404)

Next 24 hours (owners + outcomes):

1. Patch missing/incorrect redirects for top [N] URLs (DevOps/Eng) — target ≥95% single-hop [11], [13]
2. Confirm robots + meta robots on top templates (SEO/CMS) — remove any unintended blocks [21]
3. Validate canonical tags point to new URLs (SEO/CMS) [1]
4. Submit clean new-domain sitemap in GSC and monitor coverage deltas [35]
5. Review server logs for Googlebot 404/5xx rates during crawl (DevOps) [40]

Decision gate: By [date/time, within 72 hours], we will recommend either:

• Fix-forward (stay on new domain and complete signal consolidation), or
• Rollback (redirect new→old and restore old domain signals quickly per Google’s site move guidance) [1].

Expectation setting: If signal integrity is restored within 72 hours, recovery typically progresses over weeks, with stabilization often in the 8–12 week range; complex cases can take longer (we’ll provide weekly leading indicators).

Next update: [date/time].
— [Name], [Role]

Real-world communication failures to avoid

• “It’s just volatility, wait it out.” This is how robots/noindex accidents linger for weeks.
• “We’ll fix everything.” You need a prioritized hot-fix matrix: redirects, robots, canonicals, sitemaps, stability.
• “SEO will handle it.” Migrations are cross-functional by nature; Google’s move guidance requires coordinated signal alignment [1].

Actionable takeaway: Your job is to reduce uncertainty. Provide a clock, owners, leading indicators, and a rollback gate.

6) Prevention Checklist for Future Migrations (So you never run this protocol again)

Once you’ve contained the domain migration traffic drop, you need to prevent recurrence. Prevention is not “do more QA”—it’s designing the migration so failures are detectable, reversible, and limited in blast radius.

Pre-migration controls you should mandate

• Redirect design: A one-to-one redirect map for every indexable legacy URL, plus rules for parameters, faceted navigation, and trailing slashes. Validate at scale in a staging environment using list-mode crawling [15].
• Signal consistency: Internal links, canonicals, hreflang, and sitemaps all point to the same target URLs on launch day [1].
• Robots governance: A single owner for robots.txt and meta robots. Add automated checks to prevent Disallow: / or sitewide noindex from shipping. The impact of robots mistakes is well documented in case studies [21], [22].
• Dual-property GSC setup: Verify both old and new domain properties are in GSC before launch, so you can compare coverage and see errors immediately [1].
• Log monitoring dashboard: Track Googlebot 200/301/404/5xx ratios hourly for the first week post-launch (log analysis is a standard migration monitoring recommendation) [40], [45].
• Performance budgets: Don’t let the move ship with a CWV regression; it compounds instability during consolidation [62].

Merge-specific guardrails (the “website merge destroyed rankings” scenario)

Merges fail when multiple content sets collide:

• Content dedup rules: Decide which pages get consolidated, which get redirected, and which must remain unique.
• Canonical strategy for near-duplicates: If you keep both, canonicalize intentionally; don’t let templates decide accidentally.
• Category and filter parity: E-commerce merges often lose category pages because faceting rules differ; ensure mapping for the top revenue landing pages.

Example: In multiple community threads about merges, brands redirected entire sections to broad category hubs, causing relevance loss and slow recovery—an avoidable mapping error (analysis consistent with redirect relevance principles) [1].
Takeaway: Merges require relevance-preserving redirects, not just “a redirect.”

Launch playbook (minimum viable safe migration)

• DNS/SSL/CDN validated and reversible
• Redirect map tested against top 1,000 URLs
• Robots/canonicals validated on top templates via live fetch
• Sitemaps generated and submitted
• GA4 cross-domain + referral exclusions confirmed [16], [19]
• Change window reserved for rapid patches (48 hours)

Actionable takeaway: A safe migration is one you can rollback within hours and fix-forward within days. Design reversibility into the plan.

Checklist / Template Block (copy into your incident doc)

72-Hour Migration Recovery One-Pager

Hour 0–2 (Contain):

• [ ] Create incident channel + owners (SEO/Eng/Analytics/CMS/Hosting)
• [ ] Freeze non-essential releases
• [ ] Pull pre-migration robots.txt, sitemap.xml, redirects.csv

Hour 2–12 (Validate):

• [ ] Compare GA4 vs GSC trends; rule out attribution issues [16]
• [ ] Confirm no Manual Actions/Security issues [1]

Hour 12–36 (GSC + templates):

• [ ] GSC Pages/Coverage: export Errors + Valid/Excluded deltas [51]
• [ ] Live inspect top templates; record status + canonical [1]

Hour 36–60 (Redirect audit):

• [ ] Crawl redirects list-mode; remove chains/loops [11], [13]
• [ ] Reach ≥95% single-hop correct redirects (operational target)

Hour 60–72 (Signals + infrastructure):

• [ ] Robots.txt returns 200; no unintended blocks [21]
• [ ] Canonicals/hreflang updated
• [ ] New-domain sitemap submitted [35]
• [ ] Logs: Googlebot 404/5xx reviewed [40]
• [ ] Decide: rollback vs fix-forward (matrix score + red-line triggers)

Related Questions (FAQs)

1) How do I know if this is a tracking issue or an SEO issue?
Check GSC clicks/impressions first. If they’re stable but GA4 organic sessions dropped, you likely have cross-domain or attribution configuration problems after the move [16], [19].

2) What’s the fastest way to stop the bleeding in a post-migration traffic collapse?
Fix blockers and misdirection: robots/noindex, 5xx instability, and missing/incorrect redirects. Then enforce single-hop redirects and consistent canonicals/sitemaps so Google can consolidate signals [1], [11], [21].

3) Should I request reindexing for everything?
Use URL Inspection selectively for critical templates and top landing pages. Bulk recovery comes from crawlable signals (redirects, internal links, sitemaps), not thousands of manual requests (analysis aligned with Google’s emphasis on crawl/index systems) [1].

4) How long does domain migration disaster recovery usually take?
If you restore signal integrity quickly, you often see staged recovery across weeks, with many sites stabilizing in the 8–12 week range; complex migrations and merges can take months, as shown in public recovery case studies [6], [80].

5) Can I rollback safely after a domain migration traffic drop?
Yes, but do it quickly and consistently: redirect everything back, restore old signals, and keep redirects in place long enough for reprocessing. Google’s documentation supports reversing a move operationally by re-aligning signals [1].

CTA

If your domain migration traffic drop is still unfolding—or you suspect a website merge destroyed rankings—don’t let the next 48 hours be guesswork. Use this protocol as your incident runbook, and assign owners today. If you want a second set of eyes on your GSC signatures, redirect integrity, and the undo vs. push-forward score, Iriscale can run an emergency migration triage and produce a 7–14 day recovery sprint plan aligned to Google’s site-move requirements [1].

Sources

[1] https://developers.google.com/search/docs/crawling-indexing/site-move-with-url-changes
[2] https://support.google.com/webmasters/thread/309893296/page-with-redirect-issue-in-google-search-console-post-october-23-2024?hl=en
[3] https://www.youtube.com/watch?v=BQ7LrxdF-eo
[4] https://seobotai.com/blog/page-with-redirect-report-in-google-search-console/
[5] https://developers.google.com/search/blog/2019/01/focusing-on-new-search-console
[6] https://digitaloft.co.uk/our-work/outdoor-toys/
[7] https://www.linkedin.com/posts/emmalouisewilson_we-took-on-a-client-during-a-complete-website-activity-7434221030010867712-7iu0
[8] https://www.reddit.com/r/TechSEO/comments/1r58qpy/domain_migration_disaster_98_traffic_drop/
[9] https://sadekurrahman.com/how-to-recover-lost-traffic-after-site-migration/
[10] https://support.google.com/webmasters/thread/418325292/massive-traffic-drop-after-domain-migration-despite-perfect-301-gsc-setup?hl=en
[11] https://www.screamingfrog.co.uk/seo-spider/issues/response-codes/internal-redirect-chains/
[12] https://www.cueforgood.com/blog/how-to-find-redirect-chains-using-screaming-frog/
[13] https://www.screamingfrog.co.uk/learn-seo/redirects/
[14] https://www.impactmedia.co.uk/insights/simple-seo-tasks-for-wordpress-websites/
[15] https://www.screamingfrog.co.uk/seo-spider/tutorials/audit-redirects/
[16] https://support.google.com/analytics/thread/418514850/possible-attribution-issue-with-google-organic-traffic-in-ga4?hl=en
[17] https://www.linkedin.com/posts/kachi-marketing_ga4-digitalmarketing-ai-activity-7432743095789699072-W4xx
[18] https://www.facebook.com/groups/1518451318635487/posts/2236314753515803/
[19] https://www.bounteous.com/insights/2025/12/05/ga4-attribution-issues-explained-not-set-unassigned-and-more/
[20] https://www.reddit.com/r/GoogleAnalytics/comments/1bx7wbt/help_trying_to_diagnose_attribution_issue_in_ga4/

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