problem to add a RSS feed

Hello,
I try to add the RSS feed from the website www.aphg.fr (URL for the RSS feed : https://www.aphg.fr/spip.php?page=backend) in my Zotero but I can't save it (the button to validate the URL stays grey).
I have the latest version of Zotero and I have no difficulties to register other RSS feed.
What's the matter with this website ?
Thank for your help !
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