In our RDS farm of Windows 2022 servers we can shadow with no rpoblems to full desktop sessions. But a shadow to a remote app session shows only a black screen with the mouse cursor. I can see the movement of the cursor and if I control the session I can also control the mouse but do not see where I am clicking :-)
No errors in the event logs. This happens generally on all servers no matter where the client is connected from.
Thanks if anybody has a clue.
Petr