Once in the game, tap on the 3 dots on the lower-right side of the screen and select settings, go to account and select switch account and select which platform the account is linked to.
Note: Please make sure that the correct platform login where the account is linked to (Game Center, Google, or Facebook) is logged in your device.
Friendly Tip: In case you find this article of no help, please do not choose to resolve and contact our customer support instead, we are here to help!