Add items by identifier with DOI error "Lookup Failed: Zotero could not find a record..."

I have Zotero 5.0.76. This morning I successfully added a journal article DOI 10.1145/3072959.3073699. Now when I try to Add items by identifier with any DOI, after ~20 secs, I receive "Lookup Failed: Zotero could not find a record for the specified identifier. Please verify the identifier and try again." for 90% of my attempts. Have can resolve this issue?
  • The Crossref service used by Zotero and many other tools for DOI lookup has been having trouble for the last few days. Hopefully they'll resolve that soon.
  • (This can be unpinned; the underlying issue at CrossRef has been fixed)
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