When going to start the Processing Server, it shows the green started arrow, then after a minute or so it drops back to the yellow pause icon that says restarting. If you open the Windows Application Event Log, you will see the following message:
"FlexiBr: Processing Server restart Could not launch the licensing system: No working license selected on <LicensingServerAddress>"
The license is not selected in the License Manager.
Right-click on the license number in the License Manager and choose "select", the green checkmark will appear on the left of the license number then. The server stays connected now and the station can be added. The license is being read properly in the Administration & Monitoring Console as well.