I wait for fix in game in subject of not existing login to google account button in game's setting menu. I know from customer support , it is a bug after defining too low age of player on the begining of game and starting it as guest. It closes the possibility to make real purchases and sync to google for play the game on different devices. It should be fixed in future update .. but no one know when . Maybe you have more info about a date, month ?
Could you confirm the info from support , this fix will be implemented ... or maybe not ?