MMO Champion Feed returning 403 (works in browser)

The feed for MMO Champion is returning a 403 error in NewsBlur but works when loaded directly in the browser. Can anything be done to resolve this or are they blocking NewsBlur?

https://www.mmo-champion.com/external.php?do=rss&type=newcontent&sectionid=1&days=120&count=10

I’ve emailed Cloudflare with the new list of server IPs so they should add us to their allowlist within the next couple of days.