Error Codes

Common error codes returned by authentication methods:

Code	Description	Platform
SENSOR_NOT_AVAILABLE	Biometric sensor not available	Both
USER_CANCEL	User cancelled authentication	Both
USER_FALLBACK	User chose fallback method	Both
SYSTEM_CANCEL	System cancelled authentication	Both
PASSCODE_NOT_SET	Device passcode not set	Both
BIOMETRY_NOT_AVAILABLE	Biometry not available	iOS
BIOMETRY_NOT_ENROLLED	No biometrics enrolled	iOS
BIOMETRY_LOCKOUT	Too many failed attempts	Both
KEY_USER_NOT_AUTHENTICATED	Keystore rejected the signing operation despite successful authentication (OEM auth-token delivery bug; automatically retried before this is returned — prompt the user to try again)	Android