Hello! Error code 2 means that you are not authorised in Family Control or device is under control of adult account.
you have to use real device with apple’s child account
dimius555
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Thanks for your respond! But the biggest problem I faced is that DeviceActivityMonitor extension doesn't work. I completely don't know why. Only if I run it from Xcode it works, but if I run the simple app - it doesn't do anything. At least in Xcode 13.1
Seems like example in link don't work (Xcode 13)