We would also like to have this feature. We have users that login via email/password, but if they are in certain email domains, we want to force them to use the SSO sign in option. As it is now, we can’t show the error on the login page and have to show them an error on a completely different page and then require them to go back to the login page to use the SSO option. Very inconvenient compared to when new users are registering, we can catch those situations (pre-registration action) and show an error on the login page itself asking the user to use the SSO login option.
@dan.woda Are there any plans to have this pre-login action any time soon?