Face ID failed to open,it shows depth camera problems please sort out this
Face ID suddenly stop working ,the buttons front of Face ID or add face doesn’t turn on
iPhone 11, iOS 15
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See this support article:--> If Face ID isn't working on your iPhone or iPad Pro - Apple Support
and/or this one:--> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support
If, after performing all the steps provided in the above support articles, the issue persists, contact Apple Support directly, using this specific link:--> Apple Support , or make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple - Find Locations - Location Selector. After checking it out, they'll give you all the available options.
Regards
Giulio