I have two sites that were set up for multisites that were working.
There were no sub-domains active but they WERE created.
Now, I've gone back to them to get started, and tried to create a new site on both of them.
There appears to have been some error, or problem, but it shows up in the Sites list??? Then I try to visit the site, but it's not there?
I made sure that registration was not disabled. What else should I be checking?