Our team's forum group for this event is private, and we have it set up so admins have to approve all members who want to join. I hadn't realized until now how awkward the process is.
Right now, it goes like this:
It could be so much simpler. Imagine this:
Boom. Done. No extra steps, no searching a page of 300 members for the hidden approval links, no confusion.

That explains why I got an error page. Got pinged for the AU group to a private board despite being a member of the group. ;P
But yeah. The new forum groups are supposedly intended to replace the old, outdated cults feature. It only makes sense to streamline this and make it easier to use, so this gets my full support.
This would be excellent.
This would be really great!