This is supposed to happen. If you have 7 supervisors licenced
but configure 9 it will give an error, because to the server it
is not about how many supervisors are logged in, but how many are configured.
It foresees a problem if all these supervisors were to log in at the same time.
I would suggest giving more than one user the same login. That way if a user
is logged on as, for example, Dave and another person logs on with the same
name it will kick out the other user.
It will also not log the error.It is only a popup message for the user.
NOTE: Never configure more supervisors than you have licensed.