Yes, so creating a GJ group on frontend works fine with interacting with CB GroupJive Forums. Issue seams entirely isolated to CB Auto Actions group create behavior, but I can't see any reason for this yet. Have retested the CB GroupJive auto action type and it's creating the Kunena forums as well. So I'm not sure what to suggest. Resaving the groups that are missing their forum categories should create them.
The only issue I could find was that creating groups without a category using that auto action doesn't work, which am fixing for a new release.
forge.joomlapolis.com/issues/8187