I am the Moodle administrator in my company. We have RADIUS server and accounts on it for all employees. Login to Moodle works OK, but the problem is that users can login with username someuser as well as with firstname.lastname@example.org . Moodle then creates two different user accounts for these two usernames. This is confusing for employees so I need help how to disable access to users who try to login without the domain. Can someone help me?