Upcoming update notes say that you would love us to test the beta for MP. How would one do that?
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Download the nevest version. In the base choose multiplayer icon (left table ivon with 2 planes at the bottom). Sesrch or create a session and play.
Those are early days so not many players are available. It is best to setup multiplayer with your friend.
Gsme has 6 servers around the world so you should check if you snd your friend are on the same server.
When in game make sure that your radio is on an mic is on. (Radio is a 3d object in your cockpit).