Harvey
You seem to be right as noted on github
Recent versions of Linux distributions have transitioned from the X11/Xorg display server to Wayland, which has introduced compatibility issues with Hyper-V's Remote Desktop Protocol (RDP) for graphical desktop environments.
This shift means that newer Linux VMs on Hyper-V, particularly those using desktop environments like GNOME, KDE, or MINT, often cannot be accessed via standard RDP because the RDP client relies on older 32-bit code that is incompatible with Wayland's 64-bit architecture.
This incompatibility is described as a fundamental issue originating from Microsoft's RDP implementation, not something that can be resolved by Linux developers.