For access to multiplayer and the Festival Playlist , you must be running the latest version available on the server. If your game version does not match the server, the online tab will appear grayed out.
This update was a focused hotfix rather than a content-heavy expansion. Key improvements included: dowload-forza-horizon-5-v1-567-563-0-update-only-online
Are you encountering a (like FH301) after this update? For access to multiplayer and the Festival Playlist