Topic
New SQLUM or CustomUM users are unable to login to K2. The following error is shown:
Exception of type 'System.Web.HttpUnhandledException' was thrown. <br/>{user name} could not be found

Instructions
- If you are using the new Sync Engine, please make sure you have the performed a sync for SQLUM/CustomUM so K2 can sync the identities.
- Make sure the user's identity can be found in Identity.Identity table on your K2 database, and the identity record has Enabled = 1, Resolved =1 and the Properties are filled correctly
- If you are on K2 5.3 or older, make sure users are not including any trailing spaces when they enter their username. Trailing spaces in the username will cause the login to fail. This has been fixed in 5.4 and above. Alternatively you can update the login page to check for trailing spaces in username and remove them before submitting the login form.
