Playing online with friends in Forza Horizon 6 is handled through Convoys. Once you create or join a Convoy, you and your friends can drive around Japan together, enter races, complete events, and stay grouped while moving between activities.
The Convoy system is the main multiplayer party feature in Forza Horizon 6. It works across free roam and online events, and a single Convoy can hold up to 12 players. That is enough for a full friend group, car meet, drift session, or private racing lobby without constantly sending new invites.