No Face ID but my Animoji works

There is no connection between Face ID and Animoji.

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.

Face ID uses the True Depth camera which uses infrared. Click on the Get Support link at the top right of this page to start the service process.

Most likely it will be the camera.