What type of add you are using ? Admob? Then follow this
If you are using admob only, it is possible to just update the settings in admob website:
- Select your app
- Click on “Blocking Controls”
- Click on “Ad Content Rating”
- Set to “G” General Audience.
With these settings it is not required to set “max_ad_content_rating” in the code. So no need to submit a new build, unless you are already
using “max_ad_content_rating”. In that case, you might need to remove it to avoid overriding.
Source link here
Or you can refer this