When admin creating user group there only note
No spaces, same as username rule
This filed allow admin to create group name whit dot inside name.
Group whit name whit dot inside hitting 404 when try to get members.
If dot is not permitted in group name We shod stop admin of creating group with DOT inside name.
If dots can be inside group names then ther is BUG getting user members for group whit DOT in name
Here I created usergroup named
After selecting that group here google chonsole results