Create User functionality not working - User not available

If Create User is complaining “User not available for any user”, please use this topic.

Please share screenshot.

I just made payment for the lab but the create user functionality is not working. on the first attempt it kept processing for a lot of time upon clicking Create User. Now It says Username too short for any username

I closed and logged in again to and was able to see my username and was login.
Thanks, will reply in case of any further issue.