Originally posted by xLew
As you know there's a HUGE game breaking bug on PS4 at the moment where you cannot play online as it boots you off the application, So if you're one of those unlucky people and you cant play multiplayer, while you're on the home screen and not in game, go to your friendslist, click blocked list and remove all the players and try again.
This has fixed the bug for many people, there's a patch due out in the next 48 hours to try and solve this.
Delete all people off of your Blocklist then it will work. I just did that and it Works.