Hello @Stephen Barrett ,
1.Microsoft Remote Desktop uses the URI scheme rdp://query_string to store pre-configured attribute settings that are used when launching the client. The query strings represent a single or set of RDP attributes provided in the URL. The RDP attributes are separated by the ampersand symbol (&).
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/dn690096(v=ws.11)?redirectedfrom=MSDN
Have you configured the GPO for RemoteApp Programs in Group Policy? https://rdr-it.com/en/gpo-deploy-remoteapp-programs/
FYI: https://learn.microsoft.com/en-us/answers/questions/315333/launch-mac-microsoft-rdp-with-url.html
2.There is a new beta version released which you could have a try:
https://install.appcenter.ms/orgs/rdmacios-k2vy/apps/microsoft-remote-desktop-for-mac/distribution_groups/all-users-of-microsoft-remote-desktop-for-mac
Best regards,
Leila
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