How can I avoid 'A product is missing a field: google_product_category' warning in facebook microdata debugger tool?

Question

The tool https://business.facebook.com/ads/microdata/debug gives me the warning

Which OpenGraph tag can I use to fix the problem?

The HTML code like

<meta property="google:product:category" content="Pet Supplies"/>
    or
<meta property="google_product_category" content="Pet Supplies"/>

doesn't work for me.

Answer 1

I have found the solution

the right format is

<meta property="product:category" content="Apparel &amp; Accessories &gt; Clothing &gt; Dresses"/>

Answer 2

this work too... I used it for multi-languages pages and works fine, just set the ids from google in google_product_category list

<meta property="product:category" content="233"/>