I can’t use Face ID

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.

Disabled Face ID alert on your device

The link on top of this page, under the "Related Article” is the process to be followed if nothing works then please read --> "What to do Next" section. 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