In Chat, external users and rooms are marked as external so you always know if you’re chatting with people outside your organization. Review the table below to see the differences between internal and external rooms.
To create a Room, we go to chat.google.com having logged into our G Suite session. We go to the upper left corner and click on the search engine.
Once you have chosen the option, you must Allow people outside your organization to join. Once the room is created, these settings cannot be changed.