So that’s the problem. If clients already have a G4 property, we won’t be able to provide them any kind of GA data in the reporting. I hope this enhancement is added to the GA extension roadmap soon.
We checked this, but the current GA API doesn’t have support for this. We can’t do anything about it until their API is updated.
For now the best practice is to set this while creating properties or running both GA3 and GA4 at the same time.
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