We couldn’t archive the selected item

I have a CMS-Collection “Agenda” with some events I’d like to archive (and later delete). I can archive every event hand by hand (=open the collection-entry and press the archive-button on the bottom). But if I use the “Select…” tool an then choose “Archive” I get the error: “We couldn’t archive the selected item”

Any idea what the problem is?

Here is my public share link: LINK
(how to access public share link)

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ha 2 years later and the same issue :frowning:

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Still there in 2022.