Robot could not be licened by the server
Been having the issue randomly this week where a SideBot could not log and we get the above message. All users are created through AD and the Sidebot will be working fine then this randomly happens. User is still connected to the VPN and everything else seems to be running fine.
The same issue happened to me a couple of days ago and magically resolved itself the next day.
If the issue reoccurs please raise a ticket by dropping an email to firstname.lastname@example.org