Missing auto brightness option

If it is not there AND if you already tried to force restart your iPhone AND if you already checked you don't have enabled restrictions in Screen Time AND if you don't have any profile installed in Settings>General>Profiles... I suggest that you contact Apple Support directly, using this link:--> Get Support

Regards

Giulio

Autobrightness option now is in Settings>Accessibility>Display & Text size (scroll down at the very bottom)

Regards

Giulio

It should be the last option at the bottom, after "Reduce White Point" ...