Find My Location being turned off by teen

Hi,

I have tried looking online unsuccessfully. I do have the latest OS on the phones also.

I have screen time set up and under Content & Privacy (under Privacy) I have Share My Location marked allow. However...my son has learned while he can't change it in settings he can open the find my location on his app library and shut off the share my location button which then blocks me from seeing his location.

I have done the shut off and restart the phones, I have shut off Screen Time and restarted the phone and re engaged it....I have also removed the button from his home screen but it stays in the app library but I cannot find an option in screen time to limit him opening the app to keep him from changing it.

Any ideas/thoughts are appreciated.