I bought this game for me and my fiancee.
We, surprisingly, live in the same address.
There is no way for us to play coop together. The Game does not have an option to play LAN for the COOP campaing, but neither are we able to connect to each other through the damned GFWL. We are able to connect to other games and we are able to play campaing with other people, but as long as we are on the same network, we can't play this game in COOP.
However, we happily play other games such as CIV5 thorugh internet, with no issues at all.
How to remedy this?