Could you post the email from Google Play completely? You say that Google Play is asking your app to have a contact form but the email is saying something else, the email says your app has something that does not comply with the news policy.
Prepare for the upcoming Google Mobile Ads SDK release
The next major version release of the Google Mobile Ads SDK is expected in early 2021. Be sure to follow update guides closely to avoid potential revenue loss. See detailed migration guides
Please read below to understand how these changes may affect your app(s).
Below is a list of major API changes that will require actions before updating to the latest SDK. For a full list of changes (including additional breaking changes), please refer to the following migration guides.
Don't know if it was a appyet error but try changing the number of posts shows with the rss feed. IF you are using wordpress this can be updated from the Admindashboard . Settings-> Reading .As far as I know, 25 articles is the standard in RSS applications.