Sep 29, 2019 - 10:19 PM
The RD Session Host server then requests an RDS CAL from the Remote Desktop license server. If an appropriate RDS CAL is available from a license server, the RDS CAL is issued to the client, and the client is able to connect to the RD Session Host server and from there to the desktop or apps they're trying to use.
Oct 03, 2019 - 04:32 AM
The application works via Windows Server and the Terminal Services bit of Windows Server so need both the Windows Server CAL and the Windows RDS CAL. But as above - it should check via the server and let you know if it has no licenses available.