What I do to my Face ID work again?
My Face ID is not working
iPhone X, iOS 15
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Have a look at these two articles -
If an alert says Face ID has been disabled on your iPhone or iPad Pro
If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support
If Face ID isn't working on your iPhone.
If Face ID isn't working on your iPhone or iPad Pro - Apple Support (AZ)