For technical support or assistance with a purchase on an Android™ device, visit Google's support site. There, you'll find answers to many common questions and avenues to contact Google Play Customer …
What to do if your Authenticator gets stuck at any point during set up.
How to set up the same Authenticator on more than one device.
Basic information on the mobile version of Hearthstone
What to do if you can't resync your authenticator.
Troubleshooting steps for missing notifications on the Battle.net Mobile App
What to do if you get a "Something went wrong" error when logging in to the Blizzard Battle.net Mobile App
Troubleshooting for Hearthstone connection issues on mobile devices.
Troubleshooting steps for disconnection problems with the Battle.net mobile app
Hearthstone Patch Not Available on Mobile Platform