C++ boot task schedule error: No Mapping between account names and security ids was done (0x80070534)

I am trying to run notepad on boot following this tutorial

I get an error at the end (0x80070534) which pretty much translates to "No Mapping between account names and security ids was done"

I looked up many threads, some suggested changing the userId to "S-1-5-32-544", but I had no luck with that, even by running the executable as administrator.

Any more ideas on what I could do to get this code running?

Error is thrown at the end of the code, where RegisterTaskDefinition() gets called.

bool ScheduleTask()
{

    HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    if( FAILED(hr) )
    {
        printf("\nCoInitializeEx failed: %x", hr );
        return 1;
    }

    //  Set general COM security levels.
    hr = CoInitializeSecurity(
        NULL,
        -1,
        NULL,
        NULL,
        RPC_C_AUTHN_LEVEL_PKT_PRIVACY,
        RPC_C_IMP_LEVEL_IMPERSONATE,
        NULL,
        0,
        NULL);

    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCoInitializeSecurity failed: %x", hr );
        CoUninitialize();
        return 1;
    }

    //  Create a name for the task.
    LPCWSTR wszTaskName = L"Boot Trigger Test Task";

    //  Get the Windows directory and set the path to Notepad.exe.
    wstring wstrExecutablePath = _wgetenv( L"WINDIR");
    wstrExecutablePath += L"\\SYSTEM32\\NOTEPAD.EXE";

    //  Create an instance of the Task Service. 
    ITaskService *pService = NULL;
    hr = CoCreateInstance( CLSID_TaskScheduler,
                           NULL,
                           CLSCTX_INPROC_SERVER,
                           IID_ITaskService,
                           (void**)&pService );  
    if (FAILED(hr))
    {
          DLL_DEBUG("Failed to create an instance of ITaskService: %x", hr);
          CoUninitialize();
          return 1;
    }
        
    //  Connect to the task service.
    hr = pService->Connect(_variant_t(), _variant_t(),
        _variant_t(), _variant_t());
    if( FAILED(hr) )
    {
        DLL_DEBUG("ITaskService::Connect failed: %x", hr );
        pService->Release();
        CoUninitialize();
        return 1;
    }

    //  Get the pointer to the root task folder.  
    //  This folder will hold the new task that is registered.
    ITaskFolder *pRootFolder = NULL;
    hr = pService->GetFolder( _bstr_t( L"\\") , &pRootFolder );
    if( FAILED(hr) )
    {
        DLL_DEBUG("Cannot get Root Folder pointer: %x", hr );
        pService->Release();
        CoUninitialize();
        return 1;
    }
    
    //  If the same task exists, remove it.
    pRootFolder->DeleteTask( _bstr_t( wszTaskName), 0  );
    
    //  Create the task builder object to create the task.
    ITaskDefinition *pTask = NULL;
    hr = pService->NewTask( 0, &pTask );

    pService->Release();  // COM clean up.  Pointer is no longer used.
    if (FAILED(hr))
    {
          DLL_DEBUG("Failed to create a task definition: %x", hr);
          pRootFolder->Release();
          CoUninitialize();
          return 1;
    }

    //  Get the registration info for setting the identification.
    IRegistrationInfo *pRegInfo= NULL;
    hr = pTask->get_RegistrationInfo( &pRegInfo );
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot get identification pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    hr = pRegInfo->put_Author(L"Vladimir Putin");
    pRegInfo->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot put identification info: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

     //  Create the settings for the task
    ITaskSettings *pSettings = NULL;
    hr = pTask->get_Settings( &pSettings );
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot get settings pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    //  Set setting values for the task. 
    hr = pSettings->put_StartWhenAvailable(VARIANT_TRUE);
    pSettings->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot put setting info: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  Get the trigger collection to insert the boot trigger.
    ITriggerCollection *pTriggerCollection = NULL;
    hr = pTask->get_Triggers( &pTriggerCollection );
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot get trigger collection: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    ITrigger *pTrigger = NULL;
    hr = pTriggerCollection->Create( TASK_TRIGGER_BOOT, &pTrigger ); 
    pTriggerCollection->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot create the trigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    IBootTrigger *pBootTrigger = NULL;
    hr = pTrigger->QueryInterface( 
        IID_IBootTrigger, (void**) &pBootTrigger );
    pTrigger->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nQueryInterface call failed for IBootTrigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    hr = pBootTrigger->put_Id( _bstr_t( L"Trigger1" ) );
    if( FAILED(hr) )
       DLL_DEBUG("\nCannot put the trigger ID: %x", hr);
    
    //  Set the task to start at a certain time. The time 
    //  format should be YYYY-MM-DDTHH:MM:SS(+-)(timezone).
    //  For example, the start boundary below
    //  is January 1st 2005 at 12:05
    hr = pBootTrigger->put_StartBoundary( _bstr_t(L"2021-01-01T12:05:00") );
    if( FAILED(hr) )
       DLL_DEBUG("\nCannot put the start boundary: %x", hr);
  
    hr = pBootTrigger->put_EndBoundary( _bstr_t(L"2099-05-02T08:00:00") );
    if( FAILED(hr) )
       DLL_DEBUG("\nCannot put the end boundary: %x", hr);

    // Delay the task to start 30 seconds after system start. 
    hr = pBootTrigger->put_Delay( L"PT30S" );
    pBootTrigger->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot put delay for boot trigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    } 

    //  Add an Action to the task. This task will execute Notepad.exe.     
    IActionCollection *pActionCollection = NULL;

    //  Get the task action collection pointer.
    hr = pTask->get_Actions( &pActionCollection );
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot get Task collection pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
        
    //  Create the action, specifying it as an executable action.
    IAction *pAction = NULL;
    hr = pActionCollection->Create( TASK_ACTION_EXEC, &pAction );
    pActionCollection->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot create the action: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    IExecAction *pExecAction = NULL;
    //  QI for the executable task pointer.
    hr = pAction->QueryInterface( 
        IID_IExecAction, (void**) &pExecAction );
    pAction->Release();
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nQueryInterface call failed for IExecAction: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  Set the path of the executable to Notepad.exe.
    hr = pExecAction->put_Path( _bstr_t( wstrExecutablePath ) );
    pExecAction->Release(); 
    if( FAILED(hr) )
    {
        DLL_DEBUG("\nCannot set path of executable: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  Save the task in the root folder.
    //  The error happens here!!!

    IRegisteredTask *pRegisteredTask = NULL;
    VARIANT varPassword;
    varPassword.vt = VT_EMPTY;
    hr = pRootFolder->RegisterTaskDefinition(
            _bstr_t( wszTaskName ),
            pTask,
            TASK_CREATE_OR_UPDATE, 
            _variant_t(L"Local Service"), 
            varPassword, 
            TASK_LOGON_SERVICE_ACCOUNT,
            _variant_t(L""),
            &pRegisteredTask);

    if( FAILED(hr) )
    {
        DLL_DEBUG("\nError saving the Task : %x\n", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    DLL_DEBUG("\n Success! Task successfully registered.\n" );

    //  Clean up.
    pRootFolder->Release();
    pTask->Release();
    pRegisteredTask->Release();
    CoUninitialize();
    return 0;
}