XStoreGetUserPurchaseIdAsync not working

[rdhasse]

I've checked all the documentation and samples I could find and cannot figure out why XStoreGetUserPurchaseIdAsync is not returning the signed in user. It is only returning HRESULT = -2143330041 (0x8007139F).

I've initialized the XStoreContext and retrieved a valid access token for my app. I'm basically calling this function consistently with what I've found in code samples.

A couple things I'm not sure about:

1. Is the publisherUserID parameter required? If so, what should it be set to?
2. Are there some permissions required in order for this API call to work?

Any help/suggestions would be appreciated.