I have an app that I have been developing, but I had issues with registering users. (The whole thing is in development and has never been deployed live yet.) I deleted one user I created and tried to reregister it to make sure the sign-up process was working correctly, but it said the email address was already in use. I then deleted all users and tried to re-enroll them, but I get the same error for all of them. Everything I have found online about it sounds like if I delete the user, I can re-enroll it later. Is this true? If so, what am I doing wrong?
(The workflow for enrolling new users and signing in existing users seems to be working correctly except for when a user has been deleted and wanting to re-enroll.)