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It sounds like you are using a "too new" Kindle app version. Try locating and installing an older version; I use v1.17. Then re-download your book with that app version. Amazon will provide a version of the book with the older DRM which Calibre (with the appropriate plugin) will be able to convert to non-DRM.
Be sure you UNcheck the "check for updates" checkbox in the older app so it won't get updated to the new version by Amazon.
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