ScreenTime API

Can the Screen Time API in iOS be used to block specific applications or application categories from getting launched? I went through the documentation here: https://developer.apple.com/videos/play/wwdc2022/110336/ and it indicates that we should be able to block certain app categories using the DeviceActivity and FamilyControl Framework.

So, I created the following code snippet: class DeviceActivityMonitorExtension: DeviceActivityMonitor {

    let store = ManagedSettingsStore()

        override func intervalDidStart(for activity: DeviceActivityName) {

            super.intervalDidStart(for: activity)

            NSLog("interval did start")

            let model = MyModel.shared

            let applications = model.selectionToDiscourage.applicationTokens

            store.shield.applications = applications.isEmpty ? nil : applications

            store.dateAndTime.requireAutomaticDateAndTime = true

        }

And made a class model

 var selectionToDiscourage = FamilyActivitySelection() {

        willSet {

            NSLog ("got here (newValue)")

            let applications = newValue.applicationTokens

            let categories = newValue.categoryTokens

            let webCategories = newValue.webDomainTokens

            store.shield.applications = applications.isEmpty ? nil : applications

            store.shield.applicationCategories = ShieldSettings.ActivityCategoryPolicy.specific(categories, except: Set())

            store.shield.webDomains = webCategories

        }

    }

I expected it to block the launch of any application, but it does not happen.

Any idea what I might be missing here? I have already added Family Controls capability to my application. Do I need any others?