I created an AZK file from a public domain book using Kindle Previewer 3.22. I then sent the file to the Kindle app on my iPad using the "File Sharing" function of iTunes 12.7.4.80 on a PC. After ejecting the device and opening the Kindle app (version 6.6), the book appeared in the library display and I was able to read it without problems.
I have attached a zipped copy of the file so that you can see if it works for you.
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