Why can’t I enable True Tone on my iPhone 11 anymore? I noticed today that True Tone has disappeared from my iPhone 11 settings. Even in the control center I can't find it anymore. I rebooted it but it didn't come back.

Any idea on why it's gone and how I can get it back ?
I just came back from the Apple Store and they found the problem: my Ambient Light sensor was faulty and they changed it for free. Thanks anyway for your help !