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In Amazon’s words:
Currently, Kindle Unlimited is only available to US customers on Amazon.com. Customers in the UK, Germany, France, Italy, Spain, India, China, Japan, Brazil, Mexico, and Canada can sign up for Kindle Unlimited in their local Amazon marketplace. We also plan to expand this service to other countries. Please stay tuned.
Which means that the message “the configuration of your current digital account does not allow you to subscribe to kindle unlimited.” It appears surely because your account has been configured with a shipping address and region different from the amazon site where you are trying to purchase the service.
So make sure that if you try to buy kindle unlimited in amazon.COM your address is in the United States and the region is set in that country, in the same way in all other regions of amazon including the .ES version in which your account must register a Spanish address to function:
First go to the Kindle Unlimited page and search for “account and lists”
Display the account and lists menu by placing the mouse on but without clicking, then look for “My apps and devices” and click
Then click on “1-click setup”
Click on “country or region settings” then on the change button.
Fill in the data and update, you can now request amazon kindle unlimited!