I was trying to run the sample program, taken from the Microsoft docs. Seems the is being created (.job file found in the C:WindowsTasks) but it is not listed on Task schedular GUI.

Is this related to interface 1.0?

EDIT:

In addition to the sample program added TASK_FLAG_RUN_ONLY_IF_LOGGED_ON flag and set the account using SetAccountInformation.

void stringError(HRESULT hr) {
    _com_error err(hr);
    LPCTSTR errMsg = err.ErrorMessage();
    fprintf(stderr, "Error (%ls) : ", errMsg);
}

int main()
{
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr))
    {
        stringError(hr);
        fprintf(stderr, "Failed to initialize COM library, error = 0x%xn", hr);
        return 1;
    }

    ITaskScheduler* pITS = NULL;
    hr = CoCreateInstance(CLSID_CTaskScheduler, NULL, CLSCTX_INPROC_SERVER, IID_ITaskScheduler, (void**)&pITS);
    if (FAILED(hr))
    {
        stringError(hr);
        fprintf(stderr, "Failed to create Task Scheduler instance, error = 0x%xn", hr);
        CoUninitialize();
        return 1;
    }

    LPCWSTR pwszTaskName = L"SampleTask";
    ITask* pITask = NULL;
    IPersistFile* pIPersistFile = NULL;

    hr = pITS->NewWorkItem(pwszTaskName, CLSID_CTask, IID_ITask, (IUnknown**)&pITask);
    if (FAILED(hr))
    {
        if (hr == HRESULT_FROM_WIN32(ERROR_FILE_EXISTS))
        {
            fprintf(stderr, "Task already exists. Attempting to delete...n");
            hr = pITS->Delete(pwszTaskName);
            if (FAILED(hr))
            {
                stringError(hr);
                fprintf(stderr, "Failed to delete existing task, error = 0x%xn", hr);
                pITS->Release();
                CoUninitialize();
                return 1;
            }

            hr = pITS->NewWorkItem(pwszTaskName, CLSID_CTask, IID_ITask, (IUnknown**)&pITask);
            if (FAILED(hr))
            {
                stringError(hr);
                fprintf(stderr, "Failed to create new task after deletion, error = 0x%xn", hr);
                pITS->Release();
                CoUninitialize();
                return 1;
            }
        }
        else
        {
            stringError(hr);
            fprintf(stderr, "Failed to create new task, error = 0x%xn", hr);
            pITS->Release();
            CoUninitialize();
            return 1;
        }
    }   

    pITS->Release();

    hr = pITask->SetFlags(TASK_FLAG_RUN_ONLY_IF_LOGGED_ON);
    if (FAILED(hr))
    {
        stringError(hr);
        fprintf(stderr, "Failed to set task flags, error = 0x%xn", hr);
        pITask->Release();
        CoUninitialize();
        return 1;
    }

    hr = pITask->SetAccountInformation(L"", NULL);
    if (FAILED(hr))
    {
        stringError(hr);
        fprintf(stderr, "Failed to set account information, error = 0x%xn", hr);
        pITask->Release();
        CoUninitialize();
        return 1;
    }

    hr = pITask->QueryInterface(IID_IPersistFile, (void**)&pIPersistFile);
    pITask->Release();
    if (FAILED(hr))
    {
        stringError(hr);
        fprintf(stderr, "Failed to query IPersistFile interface, error = 0x%xn", hr);
        CoUninitialize();
        return 1;
    }

    hr = pIPersistFile->Save(NULL, TRUE);
    pIPersistFile->Release();
    if (FAILED(hr))
    {
        stringError(hr);
        fprintf(stderr, "Failed to save the task, error = 0x%xn", hr);
        CoUninitialize();
        return 1;
    }

    CoUninitialize();
    printf("Task created successfully.n");
    return 0;
}

Issue: Unable to save the task. Prints the following error – (The task XML contains an unexpected node.) : Failed to save the task, error = 0x80041316.