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It appears that GA4 isn’t correctly associating your events to user dimensions because the client session_id and session_number parameters are missing in your events data. Despite not being mentioned in the GA4 MP documentation, including these parameters in the params object of each event, along with the client_id, should correctly tie client data to your events. There’s a bug report related to this issue which provides a relevant example, you can find it at https://issuetracker.google.com/issues/243678686. Even though it was rejected by the Google team, the information should help in solving your issue.
