[FluttterFire UI], sign up failing with social media on signup screen

[DennisKragekjaer]

Im a bit confused about this issue:

I have just implemented the SIGN IN screen. Available auth methods are email, Facebook, Apple and Google.

Everything works as intended, I can log in with email, social media. (Actually also signup with social media.

But there is a text link saying "Register", and when tapped it show the SIGN UP screen. This screen is also showing Facebook and other social media buttons, but an error occurs when tapping these (Exception is about state AuthAction.signUp).

AuthAction.signUp is not supported by OAuthFlow

So what did I misunderstand here?