Hi @Marc Thanks for posting in our Q&A.
As far as I know, it is not supported to connect to Windows 365 Cloud PC from RDCMan right now. You can use two easy methods to access a remote Windows 365 Cloud PC by Windows 365 home page and Microsoft Remote Desktop client. More details please refer to: https://www.prajwaldesai.com/how-to-access-windows-365-cloud-pc-remote/
Note: unofficial MS link, just for reference.
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