EDIT 2: Solved. I was sending uppercase characters when I would do the connection from MS RDP. My Pop OS login username has uppercase characters so I was just matching that. I got confused because the username defined in the Pop remote desktop settings is the same username, but spelled all lowercase. Once I altered the username I was sending from MS RDP to match exactly including casing, it worked.

As a side note, the default MS RDP app doesn’t handle the resolution properly. I switched to using RDCMan from the Sysinternals Suite and it handles the resolution perfectly and you can set scaling on it so you don’t have to worry about that. I’d recommend RDCMan if anyone else is running into the same issue.

EDIT: Error code image attached and extended details pasted here.

[Window Title]
Remote Desktop Connection

[Content]
An authentication error has occurred.
The token supplied to the function is invalid

Remote computer: [Redacted]

[^] Hide details  [OK]

[Expanded Information]
Error code: 0x0
Extended error code: 0x0
Timestamp (UTC): 08/05/25 01:32:11 PM
Activity ID: 2473cbfb-5b74-4229-8644-1cf6b0bb0100

Hey Everyone,

I was wondering if anyone can help troubleshoot an issue I’m having trying to RDP from my Windows 11 box to my Pop!_OS box.

I have Remote Desktop enabled in Pop and I’ve set the username and password.

When I try to connect from Windows using Microsoft’s RDP application, I get an invalid token error.

Is anyone able to tell me what I’m missing in the setup?

Thanks