Dear Howard,
I am looking for a way to require users who register via email-based self-registration, to use their email address as username, but I do not find a way in the site settings (Moodle 3.1.8). I can only find a site-wide setting to allow users to use non-alphanumeric charaters in their username, but no setting to force the use of such characters (and anyway, this would collide with the usernames created by our LDAP authentication plugin).
Do you know how I could require the email address to be username, as well as email address, for these self-registering users? I would be much obliged for that information.
Rgrds,
Paul.