This month, Killing Floor 2 is part of the PS+ game of the month.
I grabbed it and liked the solo play, and wanted to play survival with friends.
However, whatever options I try (public/private, all maps/selected map, difficulty...), the matchmaking server will never find a session, and it seems it doesn't create one either.
On the other hand, Survival VS work almost instantly.
How do I create a private session and play survival (not VS) with one or two friends on PS4?
Edit: The questions is not "How do I create a multiplayer match", but why is the normal Survival mode is bugged, and if there is a workaround to this bug. Or where to find, if available, information about that bug, since KF2 website doesn't reference that bug.