Clear data for the following apps:
Play Store
Download Manager
Google Services Framework
Restart your tablet.
Fire up the Play Store app on tablet.
Download an app. I chose PBA bowling but this is not an endorsement.
Sign in to the game using your Google account.
Bowl three spares in a row. Miss a 9 pin, and forfeit game. Quit game.
On PC, go to play.Google.com, search for Pathfinder Adventures.
Install onto Tablet.
Those steps may or may not work.
Some of those steps may it may not be needed.
Good luck.
Credit: initial advice came from this thread here: http://android.stackexchange.com/questions/51753/phone-not-appearing-in-android-device-manager
PinkRose's post in Being online required to play now. was marked as the answer