This is a session that represents a closer group/squad/party of users. It is expected that all users with the same lobby session id can see or hear each other. Users with the same lobby session id in their group presence will show up in the roster and will show up as "Recently Played With" for future invites if they aren't already
Oculus friends. This must be set in addition to is_joinable being true for a user to use invites.