Unable to add Atom-Feed

I'm trying to add an Atom feed (https://aaaaarg.fail/thing/recent.atom) to my library. It seems as though the feed is not recognized or accepted - I'm unable to press the "save" button. I was previously able to read this feed using Zotero but it stopped to update some time ago and I removed, and now I'd like to add it back again.
Thanks for any suggestion
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