Tried to join friend's campaign just a little while ago and he tried to join mine. I can play with him in other games but now we can't seem to join each other. I can join public groups, just not my friend's session. I see other posts regarding this and seems we are not alone with this issue. I have yet to see a Ubisoft employee respond to them yet even though they were made pretty early in the day. It would be nice to know that this won't happen the whole Beta.