Can’t setup my Touch ID

Setting up Touch ID on iPhones with Face ID is not possible yet.

Set up Touch ID

Tap Settings > Touch ID & Passcode, then enter your passcode. Tap Add a Fingerprint and hold your device as you normally would when touching the Touch ID sensor. Touch the Touch ID sensor with your finger—but don't press—so the device can begin recognizing your fingerprint.

Use Touch ID on iPhone and iPad - Apple Support