Steam multiplayer doesnt work

Steam mp doesnt work in packaged project (development and shipping)! I must say that I introduced steam is not the first time and everything worked. So I bought a new computer and I have ceased to integrate normally steam… Used regular create / join sessions. I don’t even have a session… (though I know how to implement it). Downloaded the plugin advanced friend session for multiplayer steam. Also not working… I don’t know what to do anymore… Read a lot…
in defaultengine.ini all wrote and id of game have indicated, the plugin is enabled. What to do?