Screen Time Content & Privacy Restrictions greyed out on my iPhone 15

1. Is this your corporate iPhone? Then please contact the system administrator of your corporate
2. If it is your personal device, in that case, do you have any profile installed by your corporate/organisation/enterprise/School Management?
   1. Erase the profile added by you If you have installed a profile on your own --> Install or remove configuration profiles on iPhone - Apple ...
   2. Or please contact the system administrator of the organisation who provided the profile to you
3. If you want to turn on SSL trust for that certificate, go to Settings > General > About > Certificate Trust Settings. Under "Enable full trust for root certificates," turn on trust for the certificate. Apple recommends deploying certificates via Apple Configurator or Mobile Device Management (MDM). --> Trust manually installed certificate profiles in iOS and iPadOS ...

K-B16 Said:

"Screen Time Content & Privacy Restrictions greyed out on my iPhone 15: We've had screen time on our iPhones for years. Current iPhone 15 for the last year. All of a sudden screen time is not working as it should, and when I go to the Content & Privacy Restrictions the entire page is greyed out, with the toggle on as if they are set. I've turned screen time off and on to try and fix the issue, I've turned the phone off and on a couple of times as well. It's not helping. How do we fix this issue?"

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See About Clearing the Caches:

System Data contains caches, which are created for ease of App Use and remembrance of use. So, clearing that may make things accessible, once more.

Use my User Tip: How to Clear "System Data" in your iPhone's Storage" - User Tip: