There are three different methods to sign in to your Flexibits account:
Email address and password
Sign in with Apple
Sign in with Google
IMPORTANT: You only need one Flexibits account for all of your devices. When you log in to your Flexibits account on other devices, choose 'Sign In' and use the same login method that you used when you originally created your Flexibits account (either your email address and password, Sign in with Apple, or Sign in with Google).
If you don't use the same sign in method, you will end up with multiple accounts which can cause sync and subscription problems.