The one that I use is set up in the same way as I mentioned in my previous comment but it’s possible that the setup could require different things, since all of our computers here are linked on an internal network so it’s possible that the IP would be required for you while it isn’t for me.
Are you not seeing both the username and the IP under the “Remote Login: On” indicator on your mac? It should be showing something like this:
I’m going to speak with someone about if we have special circumstances due to our network setup here.