Importing by identifier fails?

I thought I should try out Zotero, but I can't seem to get the "Add item(s) by identifier" button to work.

Do these need to be in some very particular format, perhaps not just the ID but the whole URL, or some magic prefix?

The button asks "Enter ISBNs, DOIs, ...", and after pasting it in, sometimes I get an error message (after a minute or two): "Lookup failed: Zotero could not find a record for the specified identifier. Please verify the identifier and try again". Sometimes it just silently fails.
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