Team Chat
Looks nice, the only thing that jumped out at me was when I collapsed the chat pane I had no indication of any new replies until I expanded it again. Maybe some sort of indication on the chat icon? and perhaps on hover a tooltip could show a bit more? ie No. of new chats in each chatroom.
Or perhaps a different route and tie notifications back to Jamroom notification system.
I am using Edge in case this might be a bug as there is a web notification option in the chat settings.