Gnome document scanner: detecting Samsung network device

Help
1

When I used another GNU/Linux distro., the way to get XSane to see the scanner was to add

tcp SEC30CDA71BCDB2.landcroft.net

to /etc/sane.d/xerox_mfp.conf where SEC30CDA71BCDB2.landcroft.net resolves to the IP address of the scanner.

Document scanner reports no devices found. How do I make it see the scanner? It is definitely connected because I can use its printing function.

2

I have

users.users.mounty = {
    ...
    extraGroups = [ "wheel" "scanner" "lp" ]
};

and

	services.avahi = {
		enable = true;
		nssmdns4 = true;
		publish = {
			enable = true;
			addresses = true;
			userServices = true;
		};
	};