This solution works for me, Thanks @Mwloczko "After spending half of day on debbuging I finally managed to fix this. In my case problem was with iOS versioning in Device Activity Monitor Extension target. Take a look at YourDeviceActivityTarget -> Build Settings: Selected lines should be deleted. If you selected it and remove it should work. I don't know if the problem is only because my phone has lower iOS version than 16.4 or that this option mismatch with version in the main project."