How to host session on dedicated server if it has no player?

What i did - i’ve crated NetId mannually.

FUniqueNetIdPtr unid = (FUniqueNetIdRef)FUniqueNetIdString::Create(FString::Printf(TEXT("Dedicated-Server%d"), 0), NULL_SUBSYSTEM);

But then it turns out that FOnlineSessionNull::CreateSession desnt even need it:

bool FOnlineSessionNull::CreateSession(const FUniqueNetId& HostingPlayerId, FName SessionName, const FOnlineSessionSettings& NewSessionSettings)
{
	// todo: use proper	HostingPlayerId
	return CreateSession(0, SessionName, NewSessionSettings);
}