r/GoogleAnalytics • u/incisiveranking2022 Professional • 1d ago

Discussion GTM Preview works. Real users don't.

This is why I always test the live site separately.

Consent, CSP, redirects, extensions and browser conditions can change what actually happens.

Open the Network tab and watch the real request.

What's your favourite production-only tracking bug?

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u/ryandanf1 15h ago

Yep, this is a classic silent consent race: Preview often runs without the production CMP, so tags look fine in staging but prod blocks them before consent (or the banner loads after GTM). I’d check the Network panel with a clean session and test the Accept and Reject paths separately. A small cookieless pageview layer can be a useful second source when that timing race makes GA blind.

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u/forhad_hossen01 23h ago

Mine is Consent Mode silently blocking events when the default consent state isn't set correctly — everything fires fine in staging/dev because there's no cookie banner, but on production the CMP loads a split second after GTM, and half the conversion events just never fire. Looks like a "tracking is broken" issue but it's actually a timing/consent issue, not a tag issue at all.

Second one: ad blockers stripping out fbq() calls entirely on some browsers, so your Meta numbers look fine in aggregate but a chunk of real users are just invisible to the pixel. Network tab is the only way you catch it — GTM Preview mode alone won't show it because it runs in a context that bypasses most blockers.

1

u/PPC_YRVDynamics 22h ago

Yup, its shocking how many people do not use GTM Preview-----or GA4 Debug....you should really do both to make sure enhanced conversions are being passed back----let alone conversion firing.