we are trying to move away from Google Analytics, where we are using the HTTP API from mobile devices. We have a plain 2.15.0 installation with IP2Location enabled and DNT disabled.
We are passing _id and, for logged users, uid. In the visitors log, we can see that a user with the same ID is tracked for multiple visits in different days.
However, when we look at the Visitors->Engagement report, it always shows “0 returning visits”.
An example of an HTTP Tracking request is:
Any idea? Are we missing something?