It Takes Two - "The other player has left the session"

H, the game is It Takes Two. I host game, my gf is trying o join, after some time she gets information that "Second Player has left the session". I've tried joining to her lobby but same thin happened to me. I have full version, she has friends pass. We've tried setting same graphic settings, using app recover, "internet cache reset?" through cmd, disabling antiviruses. The game is on steam, but we've also tried running it through ea app.