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Users of an insurance site kept being asked to verify their identity with a face scan, seconds after they had already done it. The logins were all working. The app was simply asking anyway, and it took me three rounds of debugging to find out why.
We retired the registration form on an insurance site - now your first face scan simply creates your account. Then a real user got locked out by an account they made back in 2023, and the fix taught me more than the feature did.
Our insurance site logs people in with a face scan through MyID, Uzbekistan's national ID system. A face proves who you are - but not how to reach you. I rebuilt the login so that every sign-in also checks whether the phone number on the account is still real.