For Android,

1. Tap data saving > 2. Tap log out twice > 3. Re-enter the game(it will show the last account that was logged in) > 4. Click guest > 5. Choose the platform you want to link with.

For iOS,

1. Tap data saving > 2. Tap log out twice > 3. Re-enter the game and choose the account recovery > 4. Choose the platform you want to link with

‼️ Make sure to click on the "Save data"