PDF/UA clause 7.21: Font problem (embedding, encoding or Unicode mapping) (veraPDF)

A font is not embedded, has no Unicode mapping (ToUnicode), or its widths disagree with the embedded program. Screen readers then cannot extract the text. Common with Type 3 bitmap fonts and figures exported with non-embedded fonts.

Fix

‸Compile with LuaLaTeX and OpenType fonts (fontspec); re-export PDF/EPS figures with fonts embedded (or as outlines). Avoid bitmap (Type 3) fonts.