Edit: misread the OP - Apple says:
To configure Touch ID, you must first set up a passcode. Touch ID is designed to minimize the input of your passcode; but your passcode will be needed for additional security validation:
To configure Touch ID, you must first set up a passcode. Touch ID is designed to minimize the input of your passcode; but your passcode will be needed for additional security validation:
- After restarting your device
- When more than 48 hours have elapsed from the last time you unlocked your device
- To enter the Touch ID & Passcode setting
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