Issue with MemberSettings Not Updating in Lobby (OnlineSubsystemEOS, 5.4.4/5.5.4)

Development Programming & Scripting Multiplayer & Networking
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1

I am currently developing a lobby feature using OnlineSubsystemEOS in 5.4.4/5.5.4.
However, I have encountered an issue where the member information within the lobby is not updated correctly.
Specifically, FOnlineSession::SessionSettings.MemberSettings is not being properly refreshed.

I would like to ask:
If I am using OnlineSubsystemEOS incorrectly, or if there is a necessary modification to the Engine Source, could you provide guidance on how to address this?

Here are the steps I have followed:

  1. Create a lobby using FOnlineSessionEOS::CreateSession with bUseLobbiesIfAvailable == true.
  2. After creating the lobby, send an invitation to a friend (the invitation is successfully received by the friend).
  3. The invited friend joins the lobby via JoinSession (and the JoinSession call also succeeds).
  4. Both the host and the guest monitor FOnlineSession::SessionSettings.MemberSettings to retrieve member information.

At Step #4, I expect to be able to retrieve each member’s UniqueNetId and DisplayName from MemberSettings.

While debugging the Engine Source, I confirmed that FOnlineSessionEOS::OnLobbyUpdateReceived is called on the host side.
It appears that FOnlineSessionEOS::CopyLobbyData is responsible for updating FOnlineSession::SessionSettings.MemberSettings.

However, FOnlineSessionEOS::GetDefaultLocalUserForLobby seems to access MemberSettings beforehand, and since MemberSettings is still empty when OnLobbyUpdateReceived is called, it leads to a contradiction where MemberSettings cannot be updated properly.

In particular, in
Engine\Plugins\Online\OnlineSubsystemEOS\Source\OnlineSubsystemEOS\Private\OnlineSessionEOS.cpp
within the FOnlineSessionEOS::OnLobbyUpdateReceived function, the following line appears problematic:

const EOS_ProductUserId LocalUserId = EOSSubsystem->UserManager->GetLocalProductUserId(GetDefaultLocalUserForLobby(*LobbyNetId));
Because of this, EOS_Lobby_CopyLobbyDetailsHandle sometimes fails.

If there is a correct or recommended way to properly update FOnlineSession::SessionSettings.MemberSettings, I would appreciate your advice or any related information.

2

Regarding the above question, I have temporarily resolved it myself.
I’m not sure if the correction method I used is the correct one, but the issue has been improved for now.
If there is a proper correction method, I would appreciate it if you could let me know.

Location of the code:
Engine\Plugins\Online\OnlineSubsystemEOS\Source\OnlineSubsystemEOS\Private\OnlineSessionEOS.cpp

Code after modification:

void FOnlineSessionEOS::OnLobbyUpdateReceived(const EOS_LobbyId& LobbyId)
{
	const FUniqueNetIdEOSLobbyRef LobbyNetId = FUniqueNetIdEOSLobby::Create(UTF8_TO_TCHAR(LobbyId));
	const int32 index = GetDefaultLocalUserForLobby(*LobbyNetId);
	const EOS_ProductUserId LocalUserId = EOSSubsystem->UserManager->GetLocalProductUserId(0 <= index ? index : 0);

Code before modification:

void FOnlineSessionEOS::OnLobbyUpdateReceived(const EOS_LobbyId& LobbyId)
{
	const FUniqueNetIdEOSLobbyRef LobbyNetId = FUniqueNetIdEOSLobby::Create(UTF8_TO_TCHAR(LobbyId));
	const EOS_ProductUserId LocalUserId = EOSSubsystem->UserManager->GetLocalProductUserId(GetDefaultLocalUserForLobby(*LobbyNetId));