RDP over VMBus does not work - troubleshooting tips?

Question

I have three monitors, and would like to use two of them for a VM, the third for the host.

With mstsc, this is possible by editing the .rdp file.

With vmconnect, this isn't possible, multi-monitor is a boolean all-or-nothing.

I found this article which describes "RDP over VMBus", which should, in theory, be the best of both worlds.

Only it doesn't work.

I got my VM id by running (get-vm "vmname").id.

My .rdp file looks like this:

full address:s:localhost
server port:i:2179
pcb:s:3f6d3195-7aaf-40f3-a071-5b6e118cc7ba;EnhancedMode=1

When I right-click -> connect, it is stuck at "Configuring remote session...".

Any ideas?

I am running Windows 10 Pro x64 2004 on both Host and VM.

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Edit:

I found another article.

After adding the line negotiate security layer:i:0, it prompts me for credentials. when I enter the credentials for the host, I get:

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If I then remove ;EnhancedMode=1, I get a different error directly after login:

Answer 1

Hehe, I found another random article, this time not even about either mstsc or vmconnect, but a third-party product.

After adding my user to the Hyper-V Administrators group, it works.