nixos+greetd+hyprland error

Using this works:

    services.greetd = {
      enable = true;
      settings = {
        initial_session = {
          command = "Hyprland";
          user = "yashraj";
        };
        default_session = {
          command = "${lib.getExe pkgs.greetd.tuigreet} --time --cmd Hyprland";
          user = "yashraj";
        };
      };
    };

But using this doesn't:

    services.greetd = {
      enable = true;
      settings = {
        default_session = {
          user = "yashraj";
          command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --sessions ${pkgs.hyprland}/share/wayland-session --remember --remember-session";
        };
      };
    };

I wan't to be able to use --sessions. what could I be doing wrong? I am using latest nixos stable.

The only error returned here is after I enter my username 'yashraj' then my password 'nixos' is: expected Args or Cancel, got Pamresponse {resp: some("nixos")}

Notes:

I haven't commited the greetd file to my github yet. But I've still attached the link to my github if it may be relevant to solve this issue.

Please give any info