When switching accounts in ‘Google play’ modules, you cannot log back into your preferred region, you have to log into a different region, then switch back to your preferred region to log in to a second account or more (I used to play on 12).
This is for those of us who play on more than one account without the battle.net client.
If already fixed with new update, I apologize. Otherwise, please save us some time with pointless log ins to a new account on a different region.