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The returned value from DllGetActivation is S_OK, but the address is messy.

I have short program:
HRESULT(WINAPI *pfnDllGetActivationFactory)(HSTRING, winrt::Windows::Foundation::IActivationFactory);
void test()
{
CoInitialize(NULL);
HRESULT hr = S_OK;
HMODULE module = LoadLibraryA("Windows.Perception.Stub.dll");
if (!module)
{
return;
}
pfnDllGetActivationFactory = (HRESULT(WINAPI *)(HSTRING, winrt::Windows::Foundation::IActivationFactory
))GetProcAddress(module, "DllGetActivationFactory");
if (!pfnDllGetActivationFactory)
return;

   winrt::Windows::Foundation::IActivationFactory* pActivationFactory;
   std::wstring wstr = TEXT("Windows.Graphics.Holographic.HolographicSpace");
   HSTRING hstr;
   hr = WindowsCreateString(wstr.c_str(), wstr.size(), &hstr);
   hr = pfnDllGetActivationFactory(hstr, &pActivationFactory);
   if (hr == S_OK)
   {
         printf("can get the activation factory");
   }
   CoUninitialize();

}
The question is that: the return value of pfnDllGetActivationFactory is S_OK, but the address of pActivationFactory is messy. Here is the call stack:

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