How do other players obtain information about session destruction?

Development Programming & Scripting
,
1

I use UE5.2.1. Player A called CreateSession(), while Player B called JoinSession(), and everything has been normal since then. But when Player A called DestroySession() and even closed the game, Player B did not receive any notification. Player B’s FOnDestroySessionCompleteDelegate will only be triggered when Player B calls DestroySession() itself.

In addition, FOnSessionParticipantJoinedDelegate, FOnSessionParticipantLeftDelegate, and FOnSessionParticipantsChangeDelegate were not triggered in both Player A and Player B.

Thanks.

 void UMyGameInstanceSubsystem::OnCreateSessionComplete(FName SessionName, bool bWasSuccessful)
{
	_onlineSession->ClearOnCreateSessionCompleteDelegate_Handle(_dhOnCreateSessionComplete);
 
	if (bWasSuccessful)
	{
		_currentSessionName = SessionName;
		Log(FString::Printf(TEXT("createsession %s success"), *SessionName.ToString()));
 
		_dhOnSessionParticipantJoined = _onlineSession->AddOnSessionParticipantJoinedDelegate_Handle(_dlgOnSessionParticipantJoined);
		_dhOnSessionParticipantLeft = _onlineSession->AddOnSessionParticipantLeftDelegate_Handle(_dlgOnSessionParticipantLeft);
		_dhOnDestroySessionComplete = _onlineSession->AddOnDestroySessionCompleteDelegate_Handle(_dlgOnDestroySessionComplete);
		_dhOnSessionParticipantsChange = _onlineSession->AddOnSessionParticipantsChangeDelegate_Handle(_dlgOnSessionParticipantsChange);
 

		UWorld* world = GetWorld();
		if (world)
		{
			if (!world->ServerTravel("/Game/Maps/Lobby?listen"))
			{
				LogError(TEXT("ServerTravel failed"));
			}
		}
	}
	else
	{
		_currentSessionName = "";
	}
}

void UMyGameInstanceSubsystem::OnJoinSessionComplete(FName SessionName, EOnJoinSessionCompleteResult::Type result)
{
	if (!_onlineSession.IsValid())
	{
		return;
	}
	_currentSessionName = SessionName;
	_onlineSession->ClearOnJoinSessionCompleteDelegate_Handle(_dhOnJoinSessionComplete);
 
	if (result == EOnJoinSessionCompleteResult::Success)
	{
		Log(TEXT("JoinSession success"));
 
		_dhOnSessionParticipantJoined = _onlineSession->AddOnSessionParticipantJoinedDelegate_Handle(_dlgOnSessionParticipantJoined);
		_dhOnSessionParticipantLeft = _onlineSession->AddOnSessionParticipantLeftDelegate_Handle(_dlgOnSessionParticipantLeft);
		_dhOnDestroySessionComplete = _onlineSession->AddOnDestroySessionCompleteDelegate_Handle(_dlgOnDestroySessionComplete);
		_dhOnSessionParticipantsChange = _onlineSession->AddOnSessionParticipantsChangeDelegate_Handle(_dlgOnSessionParticipantsChange);
}