For some reason, all my player sessions are 1 minute, can someone explain me why?
From that screenshot all your player sessions have timed out, which has a default value of 60s.
When you make a player session reservation (CreatePlayerSesssion(s)), you have 60s for your player to connect the game server and the game server to call AcceptPlayerSession
So it looks like your server is not calling AcceptPlayerSession (or your clients never connect).
I have solved problem.