If you're like me and were staring at this error popup then, allow me to share what worked for me:

Prerequisite

You should've already enabled Remote Login in Ubuntu 24's settings with a username and password

It doesn't have to be a real user on device, just a username and password for RDP authentication purposes

You've likely already done this first step but if you haven't

1. Add PC in Microsoft Remote Desktop App for Mac with all changes that you'd like.

   

2. Export the config to a location of your choosing

   

3. Open the RDP config file with any text editor

4. Edit the line that states:
   

   use redirection server name:i:0
   

   to
   

   use redirection server name:i:1
   

5. Save file and open the RDP connection from this newly edit/saved file directly (Either by double-clicking or by dragging in the config to Microsoft Remote Desktop App)

That's it.

Hope it helped!