Can’t get feedburner to create feeds for each category

I’m trying to set up feeds for each individual category on my site, but its just not working. Feedburner keeps redirecting everything to the main feed for the entire site.

I’ve tried both

https://example.com/wp-rss2.php?cat=42
and
https://example.com/category/categoryname/feed

like it says on the feeds/rss page, the first one directs to the site universal feed, and the second goes to error. I’m using the Aspire theme if that matters. Thanks.