I have set the option to embed fonts in my document. When I save to PDF, I see the file size is now bigger. However, when processing that PDF on a specific site, it still says some fonts are not embedded :

"Fonts: We found some fonts in your file that need to be embedded. Please review your PDF and make sure all Fonts are embedded."

Does this mean specific fonts in Word cannot embedded in a PDF?

Basically, I have Arial everywhere. On the start of a chapter, I have Times New Roman.