When trying to leave a review, I get this message from Amazon.

"We apologize, but this account has not met the minimum eligibility requirements to write a review. If you would like to learn more about our eligibility requirements, please see our community guidelines."

Amazon requires that a minimum amount of purchases need to be completed for a user to have the ability to leave reviews in that marketplace. In the U.S., it's $50.

If you’re seeing this message, it’s likely because the book’s URL from the publisher provided is to a different Amazon marketplace than yours. But don’t worry—it’s an easy fix! Just swap out the URL to match your marketplace.

Example: amazon.com/dp/ASIN change it to... amazon.co.uk/dp/ASIN

This is the list of other marketplaces offered by Amazon.