https://www.bleepingcomputer.com/news/microsoft/new-windows-10-kb5005394-emergency-update-fixes-printing-issues/ > Microsoft has released a cumulative out-of-band update to fix a known printing issue preventing some printers and scanners from working correctly. > "Addresses an issue with devices that do not comply with section 3.2.1 of the RFC 4556 specification," Microsoft explains in the KB5005394 support document.