How to Configure RDP RemoteApp Parameter Settings
Symptom
RemoteApp is not starting or closes immediately after login.
Problem
Missing or incomplete session settings on server or device
Solution
Set an ALIAS for the RemoteApp with the RemoteApp Management Console on the Terminalserver.
Use that ALIAS value in the device's setting in Setup > Sessions > RDP > RDP Sessions > (Session Name) > Server > Application.
Add two pipe-characters ( || ) at the beginning of the ALIAS value.