FACE ID DISABLED

Hello ~ We are fellow forum users like yourself and not Apple Support so we may only point you in the right direction. Work back through this article:

If an alert says Face ID has been disabled on your iPhone or iPad Pro

If no help there take your iPhone in for a checkup:

Genius Bar Reservation and Apple Support Options

~Katana-San~

See if anything here helps 

If Face ID isn't working on your iPhone or iPad Pro  *

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Face ID Not Working.   -