DefaultEngine.ini

[/Script/Engine.GameEngine]
!NetDriverDefinitions=ClearArray
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="/Script/OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="/Script/OnlineSubsystemUtils.IpNetDriver")

[OnlineSubsystem]
DefaultPlatformService=Steam
PollingIntervalInMs=20
bHasVoiceEnabled=true

[OnlineSubsystemSteam]
bEnabled=true
;SteamDevAppId=480
SteamDevAppId=786190
GameServerQueryPort=27015
bRelaunchInSteam=true
GameVersion=1.0.0.0
bVACEnabled=1
bAllowP2PPacketRelay=true
P2PConnectionTimeout=90

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="/Script/OnlineSubsystemSteam.SteamNetConnection"

[Core.Log]
LogStreaming=Verbose
LogConfig=Verbose
LogProperty=Verbose