Fix Google Merchant Center Review Feed

Job ID: 35623031

Budget: ₹600 – ₹1,500 INR

Hello,
I have an e-commerce website on Shopify, my google merchant centre reviews are approved and status is live, but the reviews are not showing up in google shopping feed. When I asked google for the same this was their reply.

NOTE: I don't have a GTIN or UPC code.

"Also I see that the MPN in the review feed is 98.56% and in the product data shows as 81%. In this case, if the products do not have GTINs, please add the Brand and MPN to all products in the Product Feed and Reviews Feed so the reviews can be matched. The Brand and MPN should always go together in pairs in order to increase the match rate. After adding the said attributes to the Product Feed, please allow 7 days for the system to complete the matching process.
Please keep in mind that ratings and reviews are matched to products based on a number of factors, the strongest being globally unique product identifiers such as GTINs (Global Trade Item Numbers). Without GTIN data, Google can still attempt to match a review through other information such as SKU (Stock Keeping Unit), Brand + MPN (Manufacturer Part Number) pairs, and product URLs. However, these identifiers generally do not offer as good a match as GTINs. Without GTINs Google may not be able to match all of your reviews to products. You may also take note of our help center article about Product Ratings basics for your reference."
Related categories: Reviews Google Shopping Google Ads