I can’t buy kindle ebooks from Amazon anymore. What is the solution?They blame Apple.

Open the Safari browser and go to amazon.com. Make sure you sign in with your account then search for the book(s) you want and purchase them. Next time you open your Kindle app you will be able to add them to your library.

You haven't been able to buy Kindle Books directly through the app for some time unless you hacked your iPhone. You should be able to purchase them using Safari.

How are you choosing your Kindle books? Are you using the Amazon app, or going to the Amazon website using Safari? Or are you using your Kindle reader? Are you doing it on your phone or your computer?