You got the “Restricted ad serving” issue from AdMob. The detailed information is “Site Behavior: Navigation”
This issue happens to your Android app.
You need to fix it to remove your ad serving restriction.
1. Upgrade the AdMob SDK to the latest version.
2. Repeat requesting a review in AdMob Policy center until it is approved. Typically it takes about a week for the restriction to be removed.
Include the below message in the review request.
We have fixed it.