Starting on July 8, 2024, a review id (<review id>) attribute will be required for all reviews when submitting a product review feed. A review ID is a permanent, unique identifier for a product review in a product review feed.
This change will allow us to support additional features in Merchant Center that will require reviews to have a unique, stable ID.
After July 8, 2024, any review submitted in a product review feed without a review ID attribute will not process successfully. This will impact the serving of the review and may impact account eligibility to display product ratings on ads.
Item-level warnings are currently displayed on the Product Reviews Diagnostics page to help identify affected reviews. To identify impacted reviews, visit the Product Reviews Diagnostics page of your Merchant Center account (or sub-account) and look for the warning “Missing review ID.”