Here is a sample console app code that will display all tasks recursively, but as I said in the comment, the output will depend if you run this as admin or not.

// include task scheduler lib from code
#pragma comment(lib, "taskschd.lib")

// some useful macros
#define WIDEN2(x) L ## x
#define WIDEN(x) WIDEN2(x)
#define __WFILE__ WIDEN(__FILE__)
#define HRCHECK(__expr) {hr=(__expr);if(FAILED(hr)){wprintf(L"FAILURE 0x%08X (%i)\n\tline: %u file: '%s'\n\texpr: '" WIDEN(#__expr) L"'\n",hr, hr, __LINE__,__WFILE__);goto cleanup;}}
#define RELEASE(__p) {if(__p!=nullptr){__p->Release();__p=nullptr;}}
#define STARTUP HRESULT hr=S_OK;
#define CLEANUP {cleanup:return hr;}

// forward declaration
HRESULT DumpFolder(ITaskFolder *fld);

int main()
{
  STARTUP;

  CoInitialize(NULL);
  {
    CComPtr<ITaskService> svc;
    CComPtr<ITaskFolder> fld;
    HRCHECK(svc.CoCreateInstance(CLSID_TaskScheduler));
    HRCHECK(svc->Connect(CComVariant(), CComVariant(), CComVariant(), CComVariant()));
    HRCHECK(svc->GetFolder(CComBSTR(L"\\"), &fld));
    HRCHECK(DumpFolder(fld));
  }

  CoUninitialize();
  CLEANUP;
}

HRESULT DumpFolder(ITaskFolder *fld)
{
  STARTUP;
  CComPtr<IRegisteredTaskCollection> tasks;
  CComPtr<ITaskFolderCollection> children;
  LONG count;

  HRCHECK(fld->GetTasks(TASK_ENUM_HIDDEN, &tasks));
  HRCHECK(tasks->get_Count(&count));

  // dump out tasks
  for (LONG i = 1; i < (count + 1); i++)
  {
    CComPtr<IRegisteredTask> task;
    CComBSTR name;
    HRCHECK(tasks->get_Item(CComVariant(i), &task));
    HRCHECK(task->get_Name(&name));
    wprintf(L"name:'%s'\n", name.m_str);
  }

  // dump out sub folder
  HRCHECK(fld->GetFolders(0, &children));
  HRCHECK(children->get_Count(&count));

  for (LONG i = 1; i < (count + 1); i++)
  {
    CComPtr<ITaskFolder> child;
    HRCHECK(children->get_Item(CComVariant(i), &child));

    // go recursive
    HRCHECK(DumpFolder(child));
  }

  CLEANUP;
}