Sessions not found over internet - Only locally [STEAM]

Development Platform & Builds
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5

Well I’ve got Steam working over the internet, tested with someone 50KM away, but within the same country. I’ve read something about issues with different countries/continents when using the 480 App ID.

Here’s what I’ve got on some of the settings.
DefaultEngine.ini
[OnlineSubsystem]
DefaultPlatformService=Steam
PollingIntervalInMs=20

[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480
GameServerQueryPort=27015
bRelaunchInSteam=false
GameVersion=1.0.0.0
bVACEnabled=1
bAllowP2PPacketRelay=true
P2PConnectionTimeout=90
 
[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="/Script/OnlineSubsystemSteam.SteamNetConnection"

projectname.Build.cs

PublicDependencyModuleNames.AddRange(new string[] { 
 	        "OnlineSubsystem",
 	        "OnlineSubsystemUtils"
         });

        DynamicallyLoadedModuleNames.Add("OnlineSubsystemSteam");

		//Uncomment if you are using Slate UI
		//PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
		
		//Uncomment if you are using online features
		PrivateDependencyModuleNames.Add("OnlineSubsystem");
		if ((Target.Platform == UnrealTargetPlatform.Win32) || (Target.Platform == UnrealTargetPlatform.Win64))
		{
			if (UEBuildConfiguration.bCompileSteamOSS == true)
			{
				DynamicallyLoadedModuleNames.Add("OnlineSubsystemSteam");
			}
		}

projectname.Target.cs

public projectnameTarget(TargetInfo Target)
	{
		Type = TargetType.Game;
        bUsesSteam = true;
	}

I hope that this might help you to find what’s wrong.