The requestor does not support fetching urls from browser. Third party

Google Tag Manager Server Container
2

Hi @sOliver.

  • Is this message coming from a Google Ads conversion tag?
  • Does this email and phone clicks GA4 events trigger when the page is being unloaded?

If so, this could cause this message to appear.

You can find more information in this comment of mine The requestor does not support sending pixels - Google Ads - #12 by giovaniortolani . It can explain your scenario, if that’s your case.