It can take up to five days to find your book online using traditional serching methods on Amazon.
If the book just went live you can try putting the exact title and author name in quotes in the Amazon search box.
You can also login to your KDP dashboard and click "Bookshelf", then find your book in the list.
Once you have found it, put your mouse over "View on Amazon" this brings up your link from various countries. From there you can pick what country you want to view, and if need be, copy and paste that link and give it to a friend or post on Social Media or your website.