name: undefined,ratingValue: undefined,ratingCount: undefined,while implementing product schema on category page using google tag manager this error occurred in page preview mode. Tags fired also showing but the custom HTML not showing any particular product information that set as data layer variable. Only showing undefined instead of page value...what can be the mistake...
Data type variable set on the tags in tag manager but in preview mode value showing undefined why?
google analytics;google tag manager;json ld