Atom feed not found for a site

Hello, I just tried adding a feed via a blog’s page, but it wasn’t discovered by the site. I view-sourced and the link rel looked valid; copying and pasting the path to the XML worked fine. I also tried rsslookup to see if it could find the feed, and it did so.

The site is https://blog.poly.nomial.co.uk/ ; I believe this has recently changed, so maybe there’s a cached version without the appropriate tag, or something?

Apologies if this is a problem on that blog’s side; I haven’t thought about this stuff in literal decades, but googling it, the tag looks right, and it’s in as expected.

And, FWIW, I’m pretty sure that over a decade of that is because your excellent work on Newsblur. Newsblur is one of oldest (and most worthwhile) annual subscriptions, thanks for keeping it going, and this backend person from having to think about web stuff =)