We have implemented an extremely simple group chat system. Whatever that is sent to this chat would be seen by everyone in the current group. When you have just logged in and you have not yet selected a group, the chat system will not allow you to send any chat. (After all, which group should it send the chat to?)
The chat you sent would be ONLY distributed to just the members of the selected Kanban group and no other. Even if you are also a member of some other Kanban group too.