"image": The attribute itemtype has an invalid value

Hi,

There are three major errors detected in Google structured data testing tool:

The attribute itemtype has an invalid value for itemprop=”image”
Publisher logo is missing and required
datePublished is missing and required

You can see the error testing any of the articles at our site, such as this one:
https://www.teaguardian.com/tea-health/defending-against-cancers/
How do we eradicated these?

Thank you for the help in advance

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