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In Google Analytics 4 (GA4), the user data might not be showing up even when you send a purchase event via Measurement Protocol using user_id as client_id due to a few reasons. One possible issue could be mismatched data or formatting issues. It’s important to ensure both user_id and client_id are sent correctly and in the right format, as GA4 has specific requirements for each identifier. Also, make sure that the user_id used is the one recognized by GA4. Moreover, there could be a delay in data processing in GA4, so the data might not show up immediately. If your Measurement Protocol requests are not correctly structured or some required fields are missing, this could also prevent the user data from appearing. Lastly, check your setup in GA4 and your data filters, as wrongly configured filters might exclude the incoming data.
