Back to the error catalogue
PDFA-FONT-NOT-EMBEDDED
input
A font is not embedded in the PDF
Every font must be embedded, including the fourteen standard PDF fonts.
Only the issuer holds this value: Factlint reports it and never fabricates it. Test your invoice to find out whether it is affected.
Why this error happens
Helvetica left out is enough to fail PDF/A validation. The recurring trap: a PDF produced by headless Chrome, wkhtmltopdf or a virtual printer is not a PDF/A, whatever its extension says.
How to fix it
The PDF must be regenerated with its fonts embedded. No automatic correction is possible: rewriting a document's glyphs would amount to producing a different document.