Unable to get PropertyDescription for customproperties

When we enumerate IPropertyStore interface using

PROPERTYKEY key;
hr = pps->GetAt(i, &key);

We get key for one of the custom property in xlsx document as

String from key = {D5CDD505-2E9C-101B-9397-08002B2CF9AE} 2

The custom property name given is "Test"

How to relate the key with the name of the custom property.

If I use PSGetPropertyDescription(key, IID_PPV_ARGS(&ppd));

I get Element not found error.

Is there anyway to use PS***** functions to find the name?

Thanks and regards,

R.Senthil