Coop - is it currently possible or not?

Hey folks!

We are two players who currently try to play coop. We have no way to connect to each other. We see each other online. We see other players online and can also interact with them in free ride. Whenever we try to invite or ask for an invitation, the game simply does nothing. Is this currently a server issue due to the new game? Or could this be an issue with teredo (if FH5 still uses this adapter)? Can you guys play coop together or are you having similar issues? Horizon Open works fine for both of us btw.

Thanks for any replies!