My iPhone Face ID does not work
my phone says a problem has been detected with your true depth camera
iPhone X, iOS 15
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If you see this message on the Home Screen or in Settings, your iPhone or iPad might need an update or service.
You might see the following message on your iPhone X or later, iPad Pro 12.9-inch (3rd generation) or later, or iPad Pro 11-inch (1st generation) or later:
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"A problem was detected with the TrueDepth Camera. Face ID has been disabled."
What to do next
- Update your iPhone or iPad to the latest version of iOS or iPadOS.
- If you still can't enroll your face or unlock your device with Face ID, take your device to an Apple Store or Apple Authorized Service Provider, or contact Apple Support about your iPhone or your iPad.
You should always have your device repaired by Apple or an authorized service provider. Improper repair, modification, or use of non-genuine Apple components in the laser systems may prevent the safety mechanisms from functioning properly and could cause hazardous exposure and injury to eyes or skin.
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copied from: If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support