I'm 100% sure its sync issue due to some mod not working correctly. Every time my friend is trying to join me he is stuck at 99% and game is saying in loading screen that "synchronizing data with other players" so its stuck. If he presses esc or xbox controller some of buttons he will spawn under the map. I hope that I will find the issue. Damn frustrating to not get to play with the other user on the server! My NAT on my router is open according to my network settings on the xbox one, and a full bar of signal from the router. Tried to restart the server, uninstalled the game and reinstalled it, tried both cable and WiFi connection and unpluged the router without results.. 9FVTo.