Face ID has been disabled on your iPhone

What was the result when you followed the guidance in the Related Article above your name on this page, that you were reading just before you posted here? If the Related Article doesn't answer your question please post back with more details about the issue and another user in this user-to-user forum will try to help.

Note that the last step in that article is to contact Apple support using the embedded link if the other steps don’t work.