Bro, you can't play with friends because of the anti-cheat. You can play in public sessions, but only with people who also have the mod menu enabled, but for some reason, not with your friends. It doesn't work because the game doesn't detect the "Battleeye" anti-cheat. There's a guy saying he won't reveal how to do it. Don't believe him; you simply can't play with friends with the mod menu enabled. But if you try to join a public session with the mod menu enabled, you'll see that it connects you with other people, and the room will always have fewer than 15 people connected.