Unable to set up Face id even after full reset
Unable to set up face id on iPhone even after factory reset
Try the instructions in the following guides to address the Face ID issues that you are having.
👉 If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support
👉 If Face ID isn't working on your iPhone or iPad Pro - Apple Support
If the guides, above, do not help resolve the Face ID issues, then contact 👉 Official Apple SupportOR you can always get your iPhone examined at the Apple Store 👉 Genius Bar Reservation and Apple Support Options or at an Authorized Service Center for further diagnosis and a resolution.
Axel F.