Using Hidden Membership for Microsoft 365 Groups

Hidden membership is supported for Microsoft 365 Groups and distribution lists. Hidden membership means that no one except members and admins can see who's in a group. It's a useful feature if you don't want people poking around to find out who's in a group or distribution list. One thing to be aware of is that once a Microsoft 365 group has hidden membership, it has it forever. Distribution lists on the other hand can flip between hidden and visible membership.