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Why this issue is happening
GTIN (Global Trade Item Number) is a mandatory attribute for CSS product pages. This error usually occurs because the submitted value has a proper format for GTIN but Google can’t recognize the product.
How to fix your issue
- Check that you've provided the right identifier for the product
- Contact the brand owner to submit the data for this product to Google through the Manufacturer Center or other means.
For more information about the validation of GTINs, refer to the GTIN Validation guide.