1 Open Settings
The option to add a second Face ID was introduced with IOS 12, so ensure that your iphone is up to date (go to Settings>general>software Update) and then go to Settings>face ID & Passcode.
The option to add a second Face ID was introduced with IOS 12, so ensure that your iphone is up to date (go to Settings>general>software Update) and then go to Settings>face ID & Passcode.