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It seems like you’ve tried several potential solutions already without success. It might be worth checking if there are differences in the configurations between the production and staging websites. Also, confirm if the staging website can send data to other GA4 properties or not. If it can’t, this may imply there’s an issue with the staging website itself. If it can, it would suggest the data is somehow being filtered before it reaches the GA4 property.
Moreover, ensure that there’s no filter set up in your GA4 that could be blocking incoming data from the staging website. If none of these options seem to solve the issue, then it might be a good idea to try sending hits directly to the GA4 Measurement Protocol API from the staging site to bypass GTM and isolate the issue further. It could also help to check if there are any errors shown in the browser console for the staging site, as these might hint at what could be going wrong with the data transfer.
