DeviceActivityMonitor Extension methods not being triggered at IOS16, but its work at IOS17

I'm writing an app that uses Family Control. Most of the functionality has already been debugged, including in the call try deviceActivityCenter.startMonitoring(activityName, during: schedule, events: [ eventName: event ]) Works fine on my IOS17 device, but on my old IOS16 device I found that it can't be called, like intervalDidStart, intervalDidEnd, eventDidReachThreshold etc can't be called. I checked some information, https://forums.developer.apple.com/forums/thread/724243 delete the Build Settings mentioned in this link, and change the ios Deployment Target to ios16, and found that it didn't work. Don't know where the problem is?

DeviceActivityMonitor Extension methods not being triggered at IOS16, but its work at IOS17
 
 
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