Sign in with Apple saying 'Sign-in not completed'

Whenever I go to sign in with Apple on my new app, I press Continue and it takes my Face ID, but it says 'Sign in not completed' right after and there is no debug details at all. How can I debug this?

My Apple Account has 2FA, terms accepted, I have selected Sign in with Apple in the App ID Configuration, I don't know what the issue is.

Sign in with Apple saying 'Sign-in not completed'
 
 
Q