Kindles do not read EPUB if sent by USB. (Amazon converts that if they transfer it via WiFi) (Calibre should have don an 'on the fly' conversion if the 'connected device' device settings had not been changed)
Note: Calibre is very forgiving of (some) coding errors that choke many devices.
Pleas answer Paul's questions, so we can refine the places to look.
How about including the PG link to the book format you downloaded
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