While looking for a solution for this issue: Unable to claim rewards on Android I stumbled upon this thread and I believe I’ve got something similar / connected to the SafetyNet checks.
I was able to install and activate Rewards on this phone; I got quite some ads and collected around 15 BATs but now I can’t claim them. I just checked with the SafetyNetTest app and it fails!
So, I really believe there’s still some bug in correctly discovering availability of SafetyNet… I obviously shouldn’t have been able to activate Rewards I guess, right?
/cc @Mattches