Connecting to RDP RemoteApp fails. IN RDP logs one can find the following error:
Error information received from server; error='ERRINFO_GRAPHICSSUBSYSTEMFAILED', code='0x0000112f'
SPS is unable to handle RemoteFX graphic functions of the target server so connecting to such servers is not possible.
In the target server RemoteFX function has to be disabled for RemoteApps to work with SPS.
Please refer to the Administration Guide:
You must disable the Use advanced RemoteFX graphics for RemoteApp group policy on the RDP server.
The policy is available at Computer Configuration > Policies > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment > Use advanced RemoteFX graphics for RemoteApp.