Here’s a screwy thought, but one I’ve not seen mentioned in this thread: is it possible that the failing font’s permission bits are set to prohibit embedding (this can be different from what the human-readable font license says is permissible), and something in Amazon’s process catches this and removes such fonts?
(Probably not, I’m sure; this would mean some fonts fail consistently while others work, and the difference would have been noticed by now.)
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