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API key in header or URL param?

When I called the Get Users endpoint with the API key in the header, as documented, I got back a 400 Bad Request {
"error": 400,
"message": "api_key is required as a header or a query parameter."

I didn't get a successful response until I moved the api_key into the URL query parameter.

Why doesn't the API successfully authenticate with the api_key in the headers?