Create Session Failed using Steam Online Subsystem

My game fails to create a session using the Steam OSS.

I have the Steam Subsystem plugin enabled, and added the following at the end of my defaultengine.ini

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

[OnlineSubsystem]
DefaultPlatformService=Steam

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480

; If using Sessions
; bInitServerOnClient=true

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName=“OnlineSubsystemSteam.SteamNetConnection”

Shift+Tab pulls up the steam overlay, and Steam shows me playing “Space Wars” but for whatever reason, I am unable to create a session.

EDIT: Update: I installed the advanced sessions plugin, and the game seems to work now.
However, sometimes when I try to create a session it sometimes fails. But then I’ll try again and it works? Finicky.