Always disconnect from sp co-op in steam version.

Hi, I have problem with connection of halo MCC Steam edition throught co-op. I launch game, I join to freinds’ lobby, we start sp co-op, start loading screen, and after that I always have two variants, I have after loading screen message that I disconnect from game or I load game, but it load levels without my friends, shile other two friends see each other in game. And most important thay see my model in start cutscene, but then it lost and in status game my nickname has gray color instead of blue. What’s problem with my game? I open all my ports for Halo Master Chief Collection Steam Edition. All of my ports opened, and I may connect to multiplayer with big ping.