I was able to get the api to work by trimming down my fields list to email_address only. I was trying to include a custom field in the fields list and obviously did not have the correct value, so once the bulk export process was "complete", I was able to retrieve the csv stream but response.content.length was always 0. Unfortunately, there was no error thrown so it wasn't until I changed the initial bulk export request to pass just the email_address only in the fields list that I was able to get a response.content with a stream I could process.
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