If you are testing out your contact seller link or leave product review link from the test email and see an error message as shown below:
This is because you are logged in as the seller of the product and Amazon does not allow you to contact yourself or leave yourself a product review. But when the buyer/recipient receives and clicks on these links, they will be able to contact and leave you a review without any issues.
*You can ensure your links are working properly if they are clickable and direct you to the Amazon page that displays this error shown above.**