I also got the licencing error that was mentioned in the original post. It was preventing me from syncing via "wireless device" with Calibre. I uninstalled CC and reinstalled it. This seems to have fixed it for now... CC is currently re-downloading all of my books, and I'm sure my settings will all be back to default. Hopefully I won't have to un/re-install any more. Stay healthy! No need to get covid trying to keep up with Amazon's problematic OS changes!
Amazon Fire 10 and Windows 10.
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