Gnome-Remote-Desktop - Reach GDM without credentials

Hi,
tried today the gnome-remote-desktops and currently searching how to connect
to GDM without providing arbitrary credentials like Windows does it?
It is rather hard to explain users to use two sets of credentials to login,
if they knew Windows RDP so far and you have only to provide one set of credentials.
And I have to side with the users, this behaviour is beyond annoying, because if a
real 2FA mechanism is used on a system you have to login 3 times.