Adding on to this comment, it is very often not possible to change your auth method.

If you use email to register, you can almost always change to a different email (same method) but you can’t change between methods, like from Google auth to Apple auth, or even to a different google auth.

You’d need to create a new account, and therefore lose all the data on your old account.

Always choosing email gives you the most control and most privacy, I’d strongly recommend it.