To find out what the maximum number of current employees and simultaneous sessions allowed by the licence is, follow these steps.
In the Admin Tool. click Licence Keys.
On the right:
Maximum Live Employees (Current)
Maximum Simultaneous Sessions (users allowed to be logged in at the same time)
If you require a higher maximum number of either employees or simultaneous sessions, a new licence will be required. Please contact your account manager if this is required.