Emil Ryd

Hi! Me and my friend have been trying to play the Halo: CE Remastered campaign together but we do not seem to be able to join eachother. He cannot join my lobby and I cannot join his. We have both port-forwarded for Xbox Live and both have Open NAT. We can play Halo 5 just fine together and we both have 250Mbit/s Down and 100Mbit/s Up connections. What could be causing this issue? When my friend tries to join me, it tries to connect for about 30 seconds and then it says "Connection failed, your connection to the game session has failed. Please try again." Any help with this would be much appreciated!