The problem of getting the EOS_ProductUserId from FUniqueNetId

Development Programming & Scripting Multiplayer & Networking
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I am developing multiplayer shooter for the final qualifying work at the university. As the OSS I am using EOS with UE OnlineSubsystem API to create sessions and lobbies.

However I also would like to use EOS SDK API in my project in order to use all the necessary features of EOS SDK API.

Here is my OnLoginComplete function, where I am trying to get EOS_ProductUserId from FUniqueNerIdString and parse it to EOS_ProductUserId with EOS_ProductUserId_FromString. I write this value to the class member Eos_ProductUserId:

void ULab4GameInstance::OnLoginComplete(int32 LocalUserNum, bool bWasSuccessful, const FUniqueNetId& UserId, const FString& Error)
{
	const FUniqueNetIdString UniqueNetIdString = static_cast<FUniqueNetIdString>(UserId);
	TArray<FString> AccountIds;
	UniqueNetIdString.UniqueNetIdStr.ParseIntoArray(AccountIds, EOS_ID_SEPARATOR, false);

	FString EpicAccountIdString;
	FString ProductUserIdSting;
	
	if (AccountIds.Num() > 1 && AccountIds[1].Len() > 0)
	{
		ProductUserIdSting = AccountIds[1];
	}
	
	if (AccountIds.Num() > 1 && AccountIds[0].Len() > 0)
	{
		EpicAccountIdString = AccountIds[0];
	}
	
	Eos_ProductUserId = EOS_ProductUserId_FromString(TCHAR_TO_UTF8(*ProductUserIdSting));
}

And then I use variable Eos_ProductUserId in EOS SDK API functions, like this:

	EOS_Leaderboards_QueryLeaderboardRanksOptions LeaderboardRanksOptions = {0};
	LeaderboardRanksOptions.ApiVersion = EOS_LEADERBOARDS_QUERYLEADERBOARDRANKS_API_LATEST;
	LeaderboardRanksOptions.LeaderboardId = TCHAR_TO_UTF8(*FString(TEXT("PlayersFragsLeaderboard")));
	LeaderboardRanksOptions.LocalUserId = Eos_ProductUserId;
	
	EOS_Leaderboards_QueryLeaderboardRanks(LeaderboardsHandle, &LeaderboardRanksOptions, nullptr, &CompletionDelegateLeaderboards);

And every time I call the function given below, I always get the same error: EOS_IvalidUser.
Does anyone know what the problem is?
I know for sure that the problem is not related to memory managment. I guess the problem lies precisely in the ProductUserIdString, where I don’t take into account the null terminated char or something else.
Please, let me know, if you have an idea, how to fix this issue. Thank you.