My Face ID needs to be activated
Please help me to activate my phone Face ID
Question marked as
How to set up and use Face ID is described in this support article --> Use Face ID on your iPhone or iPad Pro - Apple Support
If instead you mean it is disabled, this document is specific to seeing a 'disabled' Face ID alert, and explains what to do when you see that notice. --> If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support