You cannot login to ControlUp Real Time Console in an On-Premises mode environment.
The message you receive is - "Authorization Failed"
It appeared that the password for the two service accounts that needed to run the ControlUp services were expired. So, AD was not letting them to run the services.
You can verify if this is indeed the case, if you try to restart the ControlUp services and they do not start back -
To receive more details about the failure, you can look at the login log which is located on the On-Premises server in C:\Program Files\Smart-X\ControlUp Server\Websites\UserManagementService\4.1_WS\user management.log