Google is sending errors via the Google Search Console to those who set up AMP pages to "fix errors on your AMP pages." The error reads:
Google systems have detected that some of your AMP pages do not meet our guidelines and will therefore not show in Google Search AMP-related features. The following report provides examples of pages with errors:
Then it is followed by a big button to "See AMP Errors."
Here is a screen shot:
This site that you are reading here, I am proud to say is AMP error free:
But I am told the WordPress AMP Plugin that many many sites are using might not be AMP error free.
Joe Youngblood said on Twitter is WordPress site received the error and the site in the screen shot above is a WordPress site also.
There may be issues with some embeds, who knows?
If you get this email, check it out, maybe there is nothing to do but it is important to spend the time checking.
Forum discussion at Twitter.