Reset password
How to reset my password for my ICloud I forgot it but can still login with Face ID but can’t change it
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If you can still sign in to your iPhone with your FaceID, you can change your password to your Apple ID (iCloud) here: Settings > Apple ID > Password & Security
Select Change Password. Enter your passcode for your iPhone and create a new Apple ID Password.
If you cannot change your code, start here:
If you forgot your Apple ID password - Apple Support