A friend and I had the same problem a few years back - never did find a solution unfortunately. But I did pick up a couple of titbits that might be contributing -
are either of you still using windows 7?
are either of you using AMD hardware? (Very old issue, should be long since fixed, but just in case.)
is the hosting PC definitely powerful enough? (I would imagine if it’s low powered, it would more likely just result in a lot of lag rather than fail altogether, but I guess it’s worth being sure.)
Well, the only connection I can see to past known issues is the ryzen processors - there was some issue way back linked to AMD processors - but my understanding was that issue was supposed to have been resolved years ago.
The only possibly relevant post I can find is this exchange from 2019.
Hopefully when the community managers come back to work on Monday they may be able to offer some solutions. Sorry I wasn’t able to help, but hopefully the extra details you’ve added will give them somewhere to start.
Hello! As wrote above, with a friend we cannot connect to each other session:
when any of us try to join the other session, the game stuck on “Attempting join game.”.
We both on pc and steam, no mods and just reinstalled the game and verified the files.
We both opened all the ports on both modem, firewall incoming and outcoming, and add to Window defencer exceptions both conanexiles folder, and Concan…exe file.