What's the Invalid Logins report?

Found under the " Administration" button, the Invalid Logins report will show you which user profiles contain incorrect login names. The report will show you the name of the enrollee, their current login name, and the error that exists.  

By clicking on the user’s name or the login name, you will be taken back to the User Enrollment page and will be able to correct the error. The most common error when creating login names is the tendency to include spaces in the name. This can be easily corrected by deleting the space.