Plutonium

Im playing with my brother and another friend, i tried changing the network to another one, unfollowing my friend on plutonium, closing and reopening steam, closing all my vpn services with the task manager but it doesnt seems to work
The error showing in the console is "@xboxlive_cantjoinsession" and in the game is "Unable to join game session"
The only thing that "fixes" that its using something like hamachi or radmin vpn but its too laggy idk why this happens because i was able to play with him like 2 days ago i didnt download anything