Unable to join friend in matchmaking

My friend and I have had trouble the past few times joining our lobbies in order to play multiplayer together. Everytime we attempt to join each other’s room, it just sits in joining player window then connection times out. We had luck in the past where we restarted the game and we were able to join but something is not working correctly. Anyone provide assistance with this matter?
thank you

Thanks for the help!

I also have this problem and I think it’s supposed to be improved in the big update patch later this Spring. Have open NAT and no amount of game/console/router resets allows us to party up in MCC. No problems in other games (Rocket League/Fortnite)