The message alerts you that if you ignore the missing font issue and proceed, the system will use a fallback font.
At its core, font substitution is a fallback mechanism. When a document uses a font that is not installed on the system opening it, the operating system or application automatically replaces that missing font with a default one. The phrase typically appears in: download font substitution will occur continue exclusive
Use a font manager (FontExplorer X, Suitcase Fusion, or Windows Font Viewer) to check the flags. If the flag includes “Restricted License” or “Exclusive,” embedding is legally prohibited. The message alerts you that if you ignore
To minimize font substitution issues: