Face ID is not working

If the issue persists, contact Apple Support directly, using this link:--> https://getsupport.apple.com/?caller=kbase&SG=SG003&category_id=SC0999&symptom_id=23303 , or make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector. After checking it out, they'll give you all the available options.

Regards

Giulio

Did the instructions in the related article link at the top of the page help at all? Do you get an error message?