It may happen that, for debugging purposes, we would need to test the sever part of the RDP defined applications.
A good way to check it, is running the RDP application using just MS Windows tools, leaving PAM apart of the picture.
This allows to discard PAM from the root cause, as it is not involved in the testing scenario.
How can I run a RDP Application without using the PAM Client?
Microsoft Windows Server environments (for the definition of the RemoteApps in the Remote Desktop Services' Collections)
A Windows computer (for running the RDP Client)