With the above code users will not see that group in settings page. So they cannot add them to that group. But if you add them to group (from back-end) then they can send message to that group.
Please test and let me know.
With the above code users will not see that group in settings page. So they cannot add them to that group. But if you add them to group (from back-end) then they can send message to that group.
Please test and let me know.