All Co-op Missions Will Not Work with Friends

I purchased the PC version of the game on the 19th. My friend and I connected online, started a party and became partners, and the first thing we did was try and play the co-op missions. Well, it won't even allow us to load into the game, and there are constant errors like "game is no longer available", or "lost connection to server" - any co-op mission just won't work for us. Then we tried to do the MP maps together, and all of those worked just fine, so it's really puzzling as to what's going on; co-op missions even worked fine for us in the open beta. 

I looked at the ports that need to be forwarded here http://answers.ea.com/t5/Technical-Issues/Star-Wars-Battlefront-Beta-issues-and-workarounds/m-p/4857746/highlight/true#M1251 and after doing so, the problem still persists. 

Please help us. One of the chief reasons we bought the game, was for the co-op missions, so this is a huge let down.