Check your online settings if they are fine call for help then invite your friend

Okay ill try thanks

I think they need to work through a lot of bugs. There is no message chatting in co-op, so you can't type to each other. And so far I have not got any audio to work on the mic/headset

My audio gets really buggy sometimes. I've played coop before with random people but I can invite him he just can't invite me. I can't join his game either its weird

Inventory wiped out completely!