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Errors trying to use backlog quote API

I can't seem to get a valid response from the backlog API, even using the example request from the documentation.  No matter what I do, I get this error (which isn't documented anywhere that I can find):

{'fault': {'faultstring': 'Invalid API call as no apiproduct match found', 'detail': {'errorcode': 'keymanagement.service.InvalidAPICallAsNoApiProductMatchFound'}}}

What am I doing wrong?

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