it seems like amazon have blocked side loading / email loading of registered books. I was not aware of that.
A phone call to Kindle tech support should confirm or deny. Maybe the kindle has to have confirmation direct from the amazon server, simultaneous with the book, before it allows use ?
So you'll have to jailbreak them in order to sideload them via calibre, or via windows drag n drop , or whatever, You have already partly succeeded with that.. I think that's we can say here.
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