Hello, as I understand it.
At first you app will be in "limited ad serving" mode and when your app will pass all the checks it will be in "normal ad serving" mode.
Here are the checks :
- Your app must be published.
- Your app must be listed in a supported store (Amazon Appstore, OPPO App Market, Samsung Galaxy Store, VIVO App Store, and Xiaomi GetApps, and the AppStore)
- Your app must be set up correctly in adbom and linkid to a supported store.
Here is the article on Google Admob : support.google.com/admob/answer/10564477