Many years on, and I seem to be having this problem. When I crack the InDesign generated ePub open I see the fonts are there, but of course in the IDPF compatible obfuscated way. Renders fine with correct fonts in Adobe Digital Editions and iBooks. But KindlePreviewer seems to just ignore the fonts. Even checked that “Publisher Fonts” was the font option selected.

*Might* be a KindlePreviewer problem, as I’ve discovered that if I replace the ePub’s fonts with the original (un-obfuscated) fonts, KindlePreviewer works just fine. But seems odd that something as old as KindlePreviewer would now be having this fundamental of a problem.

Anyone else seeing this kind of an issue, or have any thoughts on it?

InDesign v. 14.0.1
KindlePreviewer v. 3.28.1