Hey my Face ID not working

Do you have a disabled Face ID alert on your device?

Please read the "What to do Next" section in this link, if nothing works as per the instruction given in this link --> If an alert says Face ID has been disabled on your iPhone or iPad Pro

The link on top of this page which you had visited, before posting this question here, is shown under the "Related Article” that may have given you an answer. If that link did not help then please mention the exact difficulty faced by you.