Fix a Facebook Pixel installation on a website - that is missing microdata

I reached out the Facebook, and they have responded as follows. "The site in question is https://kiwiearthmother.com. There is an error message 'product missing from catalogs'. Based on the review, the issue is the result of your Pixel not being installed properly. In order to use pixel data to add product to your catalogue, you must install required metadata tags on your website, which include the information about the products that you want to add to your catalogue. We have checked your website and found that some of required tags are missing. I have also attached a screenshot here for your reference of the required tags when adding the microdata. I will also share with you the Help Center link for your reference: [login to view URL]" I need the metadata installed. I have used a plugin to install the microdata, but this hasn't fixed the issue.