I\'ve just received this message from Google Play but I\'m not collecting the Advertising ID.
Reason for warning: Violation of Usage of Android Advert
I am using Crashlytics and OneSignal. Relying on @RikvanVelzen tests with Crashlytics 2.9.3, it is not the reason for my getting the messasge from Google, but OneSignal.
Google requirement is "you must provide a valid privacy policy in both the designated field in the Play Console, and from within the app."
Therefore, I believe that I need to do only two things which are not too complicated:
The following seems to provide instructions on how to do it (just one of many): https://www.iubenda.com/blog/warning-google-play-developer-policy-violation-action-required-policy-issue/