Definitely, it's not possible to send an azw3 file. I've just tested it sending one and got an email with this error:
Estimado/a cliente de Kindle:
El siguiente documento, que enviaste a 02:18 PM a las vie, ene 06, 2023 GMT, no se pudo entregar en la dirección indicada: ....
The document could not be delivered to the indicated address...
No problem with epub version. I think when they indicate azw and mobi, are referring to all the versions, including azw3.
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