I figured out what I was doing different. If I stick with the automatic username (first name from "Your name"), then no hostname. As soon as I change the username from the pre-picked one, then the hostname fills right away.
I figured out what I was doing different. If I stick with the automatic username (first name from "Your name"), then no hostname. As soon as I change the username from the pre-picked one, then the hostname fills right away.