Access Mac OS with Remote Desktop
As far as I can tell, you can't use Windows RDP to connect to a Mac OS machine.
VNC is the equivalent remote desktop server that's available on Mac OS out-of-the-box.
To use VNC, you must first enable remote sharing on the Mac and install a VNC client on Windows.
Enable VNC
Instructions to enable VNC can be found here: https://support.apple.com/guide/remote-desktop/virtual-network-computing-access-and-control-apde0dd523e/mac