Face ID is disabled
My Face ID isn’t working why is that?
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Contact Apple Support
In many cases, “Face ID Has Been Disabled” on your iPhone because of a hardware issue with the TrueDepth camera. ... You should contact Apple support as soon as possible, either online, in-store, or over the phone if you believe there's a hardware problem with your iPhone's TrueDepth camera
You can also try a force restart and see if that helps. Also read this: https://support.apple.com/en-us/HT208114