"A problem was detected with the TrueDepth Camera. Face ID has been disabled."
"A problem was detected with the TrueDepth Camera. Face ID has been disabled."
iPhone XS, iOS 15
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The TrueDepth camera has lasers, which might be disabled for safety reasons if the device malfunctions or is damaged. You can still use the device, but until your iPhone is updated or serviced, you won't be able to use Face ID, Animoji, Memoji, and some other features that use the front camera.
More information - If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support