TEN7 Blog feed broken because Feedburner alias stopped working, new URL

Feedburner started deprecating custom domains, see here: http://feedburnerstatus.blogspot.com/2019/06/mybrand-service-deprecation....

They claim that it should continue to work, but for some reason, all our feeds.ten7.com feeds are now broken, even though they said it should continue to work. How do I update the Drupal Planet feed to be the original URL, no feedburner?

New URL for TEN7 Blog's Drupal Posts
https://ten7.com/taxonomy/term/5/feed

For reference, old URL:
https://feeds.ten7.com/ten7/wclM

(Edit, depending on when you look at this URL, it might seem like it works: I changed the feeds.ten7.com alias to point to our site on ten7.com and added a redirect. While it was an alias on feedburner, it was generating 404 errors)