How can users lock fingerprint & iris data using new Aadhaar app?

The new Aadhaar App lets users lock fingerprint, iris and facial authentication to prevent unauthorised Aadhaar verification. Users need to open the app, log in with a six-digit PIN and tap "Biometric Lock/Unlock" below the Aadhaar card to enable the feature. The same option can be used to unlock the biometrics whenever required.