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Indeed. As William guessed, those fonts are obfuscated in the epub. You can't feed obfuscated fonts to Kindlegen/Previewer. They must be unobfuscated (Amazon will add their own font obfuscation to all embedded fonts). You must either tell InDesign not to obfuscate the fonts (if that's what you're using), or use Sigil to right click on the font files and remove the obfuscation. Just make sure that you're legally ALLOWED to distribute those fonts before-hand.
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