If you bought this from Deseret I note their site says this
Quote:
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eBooks and Audiobooks (MP3) are delivered instantly to the Deseret Bookshelf app. They are not compatible with Kindle or other e-reader devices. Digital items cannot be gifted.
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That suggests to me that their books have DRM protection of some kind. Maybe someone familiar with Deseret will be able to help you, I've never heard of them.
BR