If your app's primary purpose involves content or products legally restricted to adults (alcohol delivery, tobacco/vape marketplaces, adult-only content), Google requires an active age-verification gate in addition to the correct maturity rating.
Commonly missed by apps that set the correct content rating in the questionnaire but never actually implement an age gate inside the app itself — a rating alone doesn't satisfy this policy.
"Your app promotes or facilitates access to age-restricted products without an adequate age verification mechanism, in addition to the required content rating."