HI RandolfMcCurdy-6599,
Unfortunately, we don't support to troubleshooting for remote desktop app related code in current tag, I suggest we can post this issue in below forum. there will be more developer help you. Thanks for your understanding.
github forum
https://github.com/topics/forums
There is a RDP connection sequence for your reference to debug your code.
- 3.1.1 Connection Sequence
https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/023f1e69-cfe8-4ee6-9ee0-7e759fb4e4ee
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