I've been playing with a buddy Garou : Mark of the Wolves, and Last Blade, using the Create Match / Find Custom match system and everything is fine.
In the case of KOF 98 UM FE, I see him in the lobby and I try to join the game, and after a 30 seconds loading I get a message "the other player left the game" systematically. When he does the procedure, it's the same.

We havent found a single way to play Kof 98 together on GOG. Does anybody have a solution ?
I am using GOG Galaxy 2.0

Thanks !


EDIT :
Issue fixed ! The game had an installation glitch, I uninstalled/ reinstalled it and the lobby works now.