The handle object
You can find out more information about the product handle here, the Shopify handle object.
Your problem is that when you change the product handle in Shopify, the reviews on that product will no longer show up on your website.
How to fix:
- Look for that product in the product list of A2reviews app. https://app.a2rev.com/#/products
- Click the Edit product button
- When the product edit box opened, click on “Automatically update” button then “Save”
All done!