We understand how fetching in all your reviews is important to your business. However, due to the nature of Amazon review pages, we are limited by what reviews we can pull in.
At the moment, we are only able to fetch reviews from Amazon urls that have a .com and .co.uk domain extension.
For .co.uk Amazon urls, we are able to fetch only UK reviews on the page and for .com Amazon urls, we are able to fetch only US reviews on the page.
We're continuously working on improving how we fetch reviews from Amazon and so we may be able to support more domain extensions in the near future.