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Being ignorant of the KDP process, I feel it's important for those following along to understand exactly what the nature of the file is that you're "pulling back down from KDP." Is it a dual format file (mobi & kf8) like kindlegen produces, or is it either/or -- like what the customer would recieve when purchasing the ebook?
When you use mobi(kindle)unpack to examine the contents of that file, does it produce both a mobi7 folder AND a mobi8 folder? If there is no mobi8 folder, then the file is mobi7-only and will never have embedded fonts included.
There may be other issues in play, but I can't help thinking that the file you're getting back from KDP might not be what you think it is. But I can't know for certain until someone familiar with KDP can explain the nature of the file(s) you "get back" from them.
In short, I think it's possible that you're looking for embedded fonts in a mobi-only file that will never contain embedded fonts because the format doesn't support them.
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