What to do with this?

Search Engines And SEO Google
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I've had this big blue message in GA4 in the last days, telling me to fix something. I think it might be important for my Mediavine income. What do you think, should I take the time to fix it? thanks

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Great question Lizzy. That message in GA4 is worth fixing. Especially as it relates to Mediavine. It’s basically Google tapping you on the shoulder saying, “Hey, you’re missing some visitor data.”

From what I gathered (with a little help from my trusty sidekick, Chatty), it’s about consent mode. If users say “no” to cookies, GA4 stops tracking them, and you lose chunks of behavioural data. Google now tries to model that missing info, but only if consent mode is properly configured.

It won’t directly mess with your Mediavine income, but it does mean your analytics might be giving you half the story. Mediavine relies on good engagement data to optimise ads, so you want that as clean as possible.

I’m working on a little 'step-by-step' for you which I'll post when once I’ve tidied up my notes a bit ... It looks fairly easy to fix.

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Hey Lizzy. Here's what I came up with. A quick(ish) step by step you can run through to try and fix that message. Sources included so you can sanity check ;-)

I have kept it focused on Mediavine ....

1. Check what GA4 is actually complaining about

  1. Go to GA4.

  2. Bottom left, click Admin.

  3. Under Data collection and modification, click Consent settings.

  4. Click your web data stream.

On that page you will see sections for things like:

  • Advertising related consent signals

  • Behaviour analytics consent signals

GA4 will literally tell you which consent signals are missing and for which stream. That is the thing behind the blue banner. support.google.com

Make a note of what it says is missing. That tells you whether the problem is ads, analytics behaviour, or both.

2. Make sure your Mediavine CMP is actually live

Mediavine uses a CMP that is built on consentmanager and is IAB based, designed to handle GDPR, PECR and friends. It is integrated with Mediavine ads and enabled by default for EU traffic. help.mediavine.com

Quick checks:

  1. Open one of your URLs in a private window.

  2. Append ?test=gdpr to the end, like:
    https://yoursite. com/your-post/?test=gdpr

  3. You should see the Mediavine consent popup appear. help.mediavine.com

If that does not show, something is off with the CMP and best to fix that first, because GA4 cannot model anything if consent is not even being collected properly.

Also check in your Mediavine dashboard that your privacy policy URL is set, because the CMP depends on that being there. Some bidders apparently will not spend without it. help.mediavine.com

3. Confirm your CMP is capable of sending proper consent signals

Google now wants consent mode v2 and prefers you use a Google certified CMP to send consent signals automatically. support.google.com

Consentmanager is one of the CMPs that integrates with Google Consent Mode v2, so from a tech point of view it is capable of sending the right signals for GA4 and Ads. consentmanager

So in practical terms:

  • You do not need to hand code consent mode yourself.

  • You do need your GA4 tag to be the one that lives alongside that CMP and respects the consent signals.

4. Check how GA4 is installed on your site

This bit is where things usually break.

You want one clean GA4 implementation that plays nicely with the CMP, not three different tags fighting each other.

Typical setups people end up with:

  • A GA4 tag in Google Tag Manager

  • Plus a GA4 plugin in WordPress

  • Plus a manual gtag snippet from the early days

If GA4 is firing outside of the consent aware stack, GA4 might not see the consent signals properly.

So you would:

  1. Use your browser dev tools or Tag Assistant to see how many GA4 tags are actually firing.

  2. Pick one approach and stick to it, usually:

    • Either GA4 via GTM, or

    • GA4 via a single gtag.js snippet in the head

From Google’s own docs: when you use a certified CMP, the CMP sends the consent signals to Google tags, and Analytics will update its notifications once it detects those signals. support.google.com

So the key is to avoid some rogue GA4 tag that bypasses the CMP.

If you are not sure which tag is the "right" one for your setup, it's probably worth tapping up Mediavine support rather than randomly deleting stuff.

5. Turn on blended reporting once signals are sorted

Once consent signals are coming in correctly, GA4 can use behavioural modeling to fill some gaps for users who said no to cookies. support.google.com

To make sure you actually see that in reports:

  1. In GA4, go to Admin again.

  2. Under Data display, click Reporting identity.

  3. Choose Blended and save. support.google.com

This does not change what is collected, it just lets GA4 mix observed and modelled data in what you see.

6. Give GA4 a bit of time and recheck the banner

Google says it can take 48 to 72 hours for consent notifications to update after you fix things. support.google.com

After a couple of days:

  1. Go back to Admin → Consent settings.

  2. Check the same web stream again.

  3. The warnings about missing behaviour signals should either be reduced or gone. The blue banner should eventually disappear too.

Nothing in here requires you to edit code. It is more about:

  • Making sure the Mediavine CMP is live and healthy

  • Making sure GA4 is installed in a single, sensible way

  • Letting GA4 know it is allowed to model missing data

Let us know how you get on and maybe post some screenshots in this thread to help others who might have the same problem :-)

If you get stuck, post the issue here and I'll see what I can do!

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@rohanm thanks rohan, will look into it!