Unable to pull feed, feed validation says it’s a legit feed

Hi Guys, I’m trying to add a feed from this site https://www.modernhealthcare.com/healthcare-rss-feeds

All of the links I try fail. It works when I add to my Feedly and the W3 Feed Validation Service says “This is a valid RSS feed.”, but when I add it via your plugin or the Wp default widget it doesn’t work. Any ideas? If it takes purchasing an add on, please let me know.