I think I have somewhat the same problem.
I am working from home, and I have to automate a process on a server (serverC).
The process will be launched from a VM (vmB), which I can access with VPN through another server (serverA). I cannot access directly serverC, so I am trying to use UiPath on vmB.
Even though the remote runtime is installed on serverC, and I can see that it is running, when I try to indicate on screen an element of serverC, I have nothing. No error message, but also nothing happens, the best I can do is to have a clipping region, which is not what I want.
I have also downgraded the version of UIPath.UiAutomation.Activities to 19.10.1 to be consistent with the version of the runtime installed.
The remote runtime is not installed on the VM nor on serverA, and it will be difficult and very long to have it installed on both.
Is there a solution to my problem, which I don’t actually know if it is due to RDP within RDP ?