Hi Dylan,
I followed the FAQ to a T and couldn’t get it to work even using the IP address. I did not change the password, I didn’t get to that. I find it a little surprising that the Nuc would have problems with this.
What I finally did, and I don’t understand why, is to create a user account on my NAS for the Nuc+. Then I added a network share in Roon using those credentials and voila, it started rebuilding my library. So I’m guessing there’s some sort of security on my NAS that required this.
[Update] I let Roon run for several hours rebuilding my library. I have my playlists I created before and all my history. That a few other observations, I believe I came out intact in the end. And on first listening I am pleased with SQ. Now I have horsepower to play with DSP.