some additional information: I tried to add a warning to happen 10 minutes after the start time as well: guard let endDate = Calendar.current.date(byAdding: .minute, value: minutes, to: startDate), let warningDate = Calendar.current.date(byAdding: .minute, value: 10, to: startDate) else { return "Failed to create end date?" } let warningComponents = Calendar.current.dateComponents([.era, .year, .month, .day, .hour, .minute, .second], from: warningDate) // Create schedule let schedule = DeviceActivitySchedule( intervalStart: startComponents, intervalEnd: endComponents, repeats: false, warningTime: warningComponents ) I have the intervalWillEndWarning method in my DeviceActivityMonitorExtension class schedule a local notification and found that it gets triggered immediately after the intervalDidStart method gets triggered. Again, intervalDidEnd never gets called. However, if I manually call center.stopMonitoring() for my session, I get the intervalDidEnd notification. It looks like my schedule is not getting used properly but I'm not sure why..

The copyright trick did it! Thank you so much!