So I've found the problem.
on an online server of "mongodb-server" was installed.
when I changed it into "mongodb-org-server" He has shown the groups.
So it could be because it is located on the MongoDB.
My group label is not working as seen here:
The poster should have a group tag, but it doesn't show up... What am I missing?
The poster needs to set their group label in their user settings. It can be set to show nothing at all.