AMP validation error – “value” attribute in “meta” tag

Can you please clear the server cache and re-crawl your website in Google search console. And check once whether having the same issue or not. Then do let us know.

For reference please follow this tutorial: https://ampforwp.com/tutorials/article/how-to-send-for-recrawling-your-website-in-google-search-console/

Try update Yoast SEO plugin, they fixed the issue regarding this issue.

Turns out that cache was the problem. I cleared it maybe 2 versions ago and didn’t noticed that I have newer versions of AMP plugin.
Sorry for the inconvenience.