Want to access NixOS via RDP

I have a NixOS system with the Cinnamon desktop. I want to access it from a Linux Mint system using remmina. The following is part of my configuration.nix file:

### Enable the X11 windowing system.
  services.xserver.enable = true;
  services.xserver.displayManager = {
    lightdm.enable = true;
    autoLogin = {
      enable = true;
      user = "xxx";
    };
  };
### Enable the Cinnamon Desktop Environment.
  services.xserver.desktopManager.cinnamon.enable = true;
### Enable RDP.
  services.xrdp = {
    enable = true;
    defaultWindowManager = "cinnamon";
    openFirewall = true;
  }

When accessing Nix from Linux Mint via remmina, the only thing showing is the xterm terminal emulator. What has to change to see the Cinnamon desktop?

I’m not 100% sure, but I think I used cinnamon with xrdp recently.

Maybe try defaultWindowManager = "cinnamon-session" or maybe the full path like "${pkgs.icewm}/bin/icewm".

Thanks for the reply. Unfortunately, neither worked.