I've got a new tablet (same make and model) to try and replicate it, but so far to no avail. Unfortunately, removing some stuff from my Play list means I'm missing some apps, and I cant remember what they were - one of which was a FPS.
So far I haven't had any "luck". I do know Tapped Out, Hungry Shark, Asphalt 8 and the plethora of standard Google stuff isn't the cause.
I dont buy any stuff from Google Play, which fortunately rules out a lot of stuff...
I have had a look at the certification files, and unfortunately it uses the firstname.lastname@example.org