[ad_1]
Hello @alexliii,
Thank you for contacting support.
This error would appear when you have the Review Schema not associated with one of the supported types required by Google: https://developers.google.com/search/docs/appearance/structured-data/review-snippet
If you are using our plugin to add structured data, you can add the review rating to be eligible for stars on SERPs by following this guide: https://rankmath.com/kb/review-schema/
Don’t hesitate to get in touch if you have any other questions.