[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FJoinLobby](API\Plugins\OnlineServicesInterface\Online\FJoinLobby) > JoinLobby ( [FJoinLobby::Params](API\Plugins\OnlineServicesInterface\Online\FJoinLobby\Params) && Params )