#My UE3 Way
Essentially I am asking for what is comparable in UE4 to this UE3 method I was using
**the core of the UE3 code revolved around this**
//display this server's net ID, must launch game from
//commandline with ?steamsockets
OnlineSub.AuthInterface.GetServerUniqueId(outID); //OnlineAuthInterface
//cast onlineSub to steamworks version to access string conversion function
theID = OnlineSubsystemSteamworks(OnlineSub).UniqueNetIdToInt64(outID);
final function joinGame(string steamUID) {
clientmessage("joining"@steamUID);
consolecommand("open"@ "steam."$steamUID);
}