Downloading captions always returns a 403

Question

When I call the captions.download endpoint with an ID that we retrieve from the captions.list endpoint, it always returns a 403. For example:

Answer 1

From the YouTube API docs:

403 Forbidden: The permissions associated with the request are not sufficient to download the caption track. The request might not be properly authorized, or the video order might not have enabled third-party contributions for this caption.