Group chat unavailable
Within our Mac-based office we use Messages and the Bonjour service to chat with each other. We have a mix of Yosemite and El Capitan users. I'm trying to set up some groups, but if I try to send a message to more than one user, their names turn red and give the message: *user* cannot group chat. Additionally, the menu item File > Go to Chat Room is greyed out and unavailable. Is this perhaps a limitation of Bonjour, or is there a way to make it work?