Cant use the online features of Horizon 4

Hi! I cant use the online features of the game, but im not banned, I have already searched and many people have this problem, everytime i want to connect to horizon life, it drops a network diagnostic error, and tries to join! I cant use auction house, online designs, online tunings, and forzathon shop. My nat is connected, and my connection is connected. Xbox app says that everything with my connection is okay! Please help!