SSO User getting denied - "could not be registered"


#1

Reported from a user in our forums. This user has had an active CF account for a while, but when attempting to sign-in or be logged in on our discourse site they get the following error.

I have some common usernames blacklisted for the community, but none of them match the email address that is getting the error.


#2

Does anyone have any suggestions on this? Or seen anything similar?