If your HoYoverse Account is only linked to a Google/Apple account, you might encounter issues logging into the game after switching to a new device.
You can try the following methods based on your situation:
If you still have your previous device and are able to log in to the game:
Log into the game, go to Settings > Account, and open the User Center. Follow the page prompts to link your email and set your password. Then, log into the game on the new device using your email and password.
※ If the User Center shows that your email is already linked, you can log in directly with your email on the new device or reset your password.
If you've lost your previous device/can't log in to the game:
Go to the [official HoYoverse Account website], log in with your Google/Apple account, and click ""Link Email"" under Personal Information > Email to link your email and set your password.
Then, use your email and password to log into the game.
If the [official HoYoverse Account website] shows that your email is already linked, you can log in directly with your email on the new device or reset your password.