[bots]

it's a new security feature that apple brought in with the latest ios version

To reset Face ID on an iPhone with Stolen Device Protection, you can:
Go to Settings
Tap Face ID & Passcode
Tap Reset Face ID
Tap Set up Face ID to set it up again

You can also turn Stolen Device Protection on or off by:
Going to Settings
Tapping Face ID & Passcode
Entering your device passcode
Tapping Stolen Device Protection
Turning Stolen Device Protection on or off

Stolen Device Protection requires biometric authentication with Face ID or Touch ID to prevent critical device and Apple Account operations. When Stolen Device Protection is turned on, you may need to:
Wait an hour before making changes to critical security settings or your Apple Account
Authenticate using Face ID or Touch ID again to update settings
Use a Security Delay, which requires a successful Face ID or Touch ID, an hour wait, then an additional successful biometric authentication
You can set up Stolen Device Protection to always require additional security measures, even when your iPhone is in a familiar location.


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So, if you are going to make changes, do it at your home location by default