My facial recognition doesn’t work

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 this is usually a hardware problem; hence the instructions in the link to contact hardware support if the steps in the link don’t solve the problem

When Face ID is not working on your iPhon… - Apple Community

See this link and follow the instructions provided