[Transfer account to the same OS]
  If your new device runs on the same OS as your existing account,
  you can transfer your account by simply signing into the linked account.

[Transfer account to a different OS] 
If you changed your device to a different OS,
you are unable to log in using the same account.
Please note that we do not provide transferring or restoring of accounts.

We ask you to create a new account or use your previous device to access the game.