I'm getting app events through Firebase analytics on Android, and when I query the data in BigQuery I find that many (not all) of the devices don't have a "resettable_device_id" (which is the IDFA according to:
https://support.google.com/firebase/answer/7029846?hl=en).
When I look in the app's database I do see identifiers that don't appear in BigQuery, but I know these are IDFAs because they match some of the BigQuery identifiers.
The app developer says that he gets the identifiers I see in the database from Play services, and he can't help with the Firebase side because the identifier is sent automatically by the SDK.
Why can't I get the identifiers? Can I change something in order to get them?
