Screentime api DeviceActivityEvent is not firing.

I've setup screen time api with encouraged & discouraged apps and monitoring apps.

    var selectionToDiscourage = FamilyActivitySelection() {
        willSet {
            print ("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.webDomainCategories = ShieldSettings.ActivityCategoryPolicy.specific(categories, except: Set())

        }
    }

        let events: [DeviceActivityEvent.Name: DeviceActivityEvent] = [
            .encouraged: DeviceActivityEvent( applications: selectionToDiscourage.applicationTokens, threshold: DateComponents(minute: 10))
        ]
        print ("Could not start monitoring \(selectionToDiscourage)")
        let center = DeviceActivityCenter()
        center.stopMonitoring()
        do {
            try center.startMonitoring(.daily, during: schedule, events: events)
        }
        catch {
            print ("Could not start monitoring \(error)")
        }

extension DeviceActivityName {
    static let daily = Self("daily")
}

@available(iOS 15.0, *)
extension DeviceActivityEvent.Name {
    static let encouraged = Self("encouraged")
}

ideally once the encouraged apps reaches 10mins screentime I should have received an event in DeviceActivityMonitorExtension. However i am not receiving any event here.

        super.eventDidReachThreshold(event, activity: activity)
        print("eventDidReachThreshold", event)
        store.shield.applications = nil
        store.shield.applicationCategories = nil
        // Handle the event reaching its threshold.
    }

Please help.