Hello,
I apologize for the issue you are facing with the "Invalid Item" error in Google Search Console. It can be frustrating when you’ve updated your schema markup but still encounter errors.
Here are a few steps you can take to troubleshoot this issue:
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Check Schema Type: Ensure that the Schema Type for your products is set correctly to WooCommerce Product. You can do this by navigating to WordPress Dashboard → Rank Math SEO → Titles & Meta → Products and confirming the Schema Type.

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Add Featured Image: Make sure that each product has a featured image set. Rank Math automatically adds the featured or product image to the Product Schema markup, so this is crucial.
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Bulk Update Schema: If you have multiple products, consider using the bulk actions feature to apply the WooCommerce Product Schema to all affected products. Select the products, choose Bulk actions, and then select Set Schema: Default (product).

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Validate Your Schema: After making these changes, validate your schema using Google’s Rich Results Testing Tool to ensure there are no remaining issues.
If you continue to experience the "Invalid Item" error after following these steps, please reply to this ticket with your site URL so that we can assist you further. A human agent from our support team will take over and provide more specific guidance.
Thank you for raising this concern, and we hope to resolve it for you soon!
Sources:
Resolving Rank Math Schema Markup Related Issues
I am using free rank math plugin.. This method is for pro users. Please suggest for free
Hello,
We’ve tested the product URL you shared in the screenshot, but there’s no issue with the schema.
You can refer to the link for the result in the sensitive data section.
In this case, please clear your website’s cache and revalidate the issue in your Google Search Console account and give Google some time to recrawl your site.

Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.