Multiplayer connection problems

Hello my name is David and I’m from Germany so sorry if type something wrong or so…
My problem is that I can’t connect to the multyplayer in FH4 . I’ve got the Xbox live Gold pass and unlocked the stuff I need to play online (Level 77) but everytime I try to connect to the multyplayer world it says
Cannot join the session.
You can find help on this topic on our support page http: // … Then some server informations and then … The served address could not be resolved. Please check your DNS settings and then try again.
On the page is nothing about my issue and I checked everything about my internet and there is nothing wrong … everything else works perfectly fine so I don’t know what the issue is and I need help!