Updated: August 14, 2025
Do not enable user-provided data collection in GA4, there are bugs, you may encounter:
#1: New users are significantly lost, reducing:
#2:Incorrect channel allocation, such as allocating most of the revenue to Unassigned or Direct:
This is because after enabling User-Provided data collection, GA4 obtains the same incorrect User ID, you can check the Effective User ID is garbled in User Explorer:
Most of the data is stored on one ID. This is to enable User-Provided data collection. The error is the ID that was received.
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