I've tried and tried all these and other Forum tips with no success. I've created/deleted/edited Windows Credentials, changed to another Zorin User Login (to avoid possible clashing with current logged in Zorin User), tried all the options in the Windows RDP Login screen (Xorg, X11rdp, Xvnc, console, vnc-any, sesman-any, neutrinordp-any), none of them work.
i've done all the sudo RDP enabling scripts, yada, yada.
All I get from Windows RDP is:
connecting to sesman ip 127.0.0.1 port 3350 [not my Zorin system iP]
sesman connect ok
sending login info to session manager, please wait . . . .
login failed for display 0