I've mentioned this before, but when I uploaded a new book last month, Enhanced Typesetting wasn't enabled when I purchased the book. I found some typos, fixed them, uploaded a revision, and hours later it was on the Amazon store with ET Enabled! I asked Support to push the new version to my archives, which they did (the main typo was fixed), but I saw no auto-hyphens when I downloaded it.
Perhaps it's only the newer Fire tablets that support Enhanced Typesetting? I bought a Paperwhite for testing, and I don't think I ever saw auto-hyphenation on it.
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