Here’s some simple, quick advice that I’m sure anyone who’s moderated an online group will agree with.
If you see this notification pop up in your Facebook group:
Ignore it. Just ignore it and move on. Do not activate this function.
No idea how this made it through Facebook’s development stream, but this seems like a path to immediate confusion, fear, and endless trouble for most communities.
If you need admins, choose them from members you know and trust.