Unable to get app wise usage duration using Screen time API

I am working with DeviceActivity to get the screen time. I always have screen time zero second (0s). But it should have some value.

I am selecting apps using familyActivityPicker and passing the tokens in the filter.

@State private var context: DeviceActivityReport.Context = .init(rawValue: "Total Activity")

filter = DeviceActivityFilter(
                        segment: .daily(
                            during: Calendar.current.dateInterval(
                                of: .weekOfYear, for: .now
                            )!
                        ),
                        users: .all,
                        devices: .init([.iPhone, .iPad]),
                        applications: applications,
                        categories: categories,
                        webDomains: webDomains
                    )

DeviceActivityReport(context, filter: filter)

I saw various posts regarding this, but nothing working in my side. I am unable to identify the issue of getting zero second all the time.