Symptoms
- Phone unlocks fine but the app won't accept biometric login
- App falls back to password every time
- Feature used to work in the app and stopped
- Error referencing biometric authentication failure
Likely causes
- CommonApp's biometric login toggle turned offApps with their own biometric login setting need it enabled separately from the phone's system setting.
- CommonBiometric data changed or re-registered on the phoneAdding a new fingerprint or face profile can require re-linking it in some apps.
- PossibleOutdated app version with a biometric integration bugThis feature can break after an OS update if the app hasn't been updated to match.
- PossibleApp requires re-authentication with a password periodically for securityFinancial and sensitive apps often require a full password login on a schedule regardless of biometrics.
- Less commonSystem-wide biometric issueIf biometrics fail everywhere, not just this app, it's a broader phone issue.
What to do
- Confirm the phone's own biometric unlock still works normally elsewhere.
- Check the app's settings for a biometric/fingerprint/face login toggle and ensure it's enabled.
- Log out and back into the app, then re-enable biometric login.
- Update the app to the latest version.
- Update the phone's OS if an update is pending.
- Re-register your fingerprint or face in phone settings if it was recently changed.
- Uninstall and reinstall the app as a last resort.
When to call a pro
If biometric unlock fails phone-wide, not just in one app, a repair shop should check the fingerprint sensor or face-recognition camera hardware.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.