12th November 2016, 23:27
I carefully checked the addition of users with system configuration. After multiple attempts I confirm that most of the time the configuration tools do not ask for the permissions. You can fill the names and password fields and then press the Apply button, and most of the time the permission window is not displayed and then the process ends at that stage. From time to time you can get the expected window in that case the user is created. I hope this could help !
SM
SM