All fix guides

Ad tracking (C3)

UTMs / click IDs in cookies or web storage

What this check means

This guide helps you act on one scan finding. It is not legal advice or a compliance verdict.

What to fix

Write UTM / click-ID values into cookies or web storage during the visit.

Step-by-step fix

  1. Enable HandL UTM Grabber (or your capture library) site-wide on the scanned domain.
  2. Exclude the landing and form URLs from “disable JS” optimization rules that break the capture script.
  3. Land with ?utm_source=test and confirm a first-party key appears in Application → Cookies / Storage.
  4. Purge caches that serve stale HTML without the script.

Confirm it is fixed

Re-scan and confirm C3 sees attribution values in cookies or web storage.

Rescan this check on your site

Scan the same URL again, then compare this check with your previous report.

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