RSS feed loads in Firefox, but not in recipe

[ashwinne]

There is an online RSS feed which I am trying to convert to a personal recipe. The RSS feed URL loads fine in any browser (Firefox/Chrome) and I can see the XML and the articles in the feed.

If I create a BasicNewsRecipe with this feed and run "ebook-convert foobar.recipe .epub" it gets stuck at this:

Conversion options changed from defaults:
  test: None
1% Converting input to HTML...
InputFormatPlugin: Recipe Input running
Using custom recipe
Using user agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.87 Safari/537.36
1% Fetching feeds...
1% Fetching feed Foobar...

All other recipes pulling feeds work fine. Anyone else seen this before? Why is this happening? Do I need to change the user_agent?