Cannot turn on Blacklist monitoring for one of my networks

I cannot get blacklist monitoring to turn on for one of my networks. It works for one, but not the other. I keep getting this error:
"It appears that your home_url setting is trying to redirect to another domain. This often happens when you are forcing https but haven't updated your site setting for that. Please verify that the home_url option of your WP install is correct, then click refresh updates in the Dashboard plugin."