Export Survey Results Not Working

Running Ironwood

Wondering if anyone has run into something similar and/or can point me to how to troubleshoot some more.

We have a survey component on each course, and can see the survey results in the UI, but clicking the Export results to CSV button appears to do nothing. Checking with Chrome Dev Tools I see the browser polling with a get_export_status every second.
The response to this is always:
{"export_pending": true, "last_export_result": null, "download_url": null}
Tailing the server logs, I see these requesting coming in, but I don’t see any logs about actually creating the CSV to download.

I’m a bit stuck with where to look next, any help would be appreciated!