Hi,

We have received reports from our users that after using our app and locking their phone, some users cannot use their fingerprints to unlock their phones.

This seems scoped to Pixel 8 (although we had one report on Pixel 7 pro) and only to fingerprint.

This is because we are calling BiometricPrompt.cancelAuthentication() just after BiometricPrompt.authenticate().

We were able to reproduce in the sample app by adding this code after this line:

lifecycleScope.launch {
     delay(2_000)
     biometricPrompt.cancelAuthentication()
}

I will attach a bugreport, sample code, sample APK and screen record in the next note...

BUILD INFO

Device type: Pixel 8
OS version: Android 14 (AP1A.240305.019.A1)
Biometric library version: 1.0.1 for Sample app but we use 1.1.0 in our own app and are able to reproduce

STEPS TO REPRODUCE

With APK attached in the next note:

Enroll fingerprint and do not enroll face
Open the sample app
Press Use Biometric and enroll for biometric
Kill the app
Open the app, and Press "Use Biometric" again
Wait for dialog to be cancelled
Lock Screen

EXPECTED RESULTS

Able to unlock the phone with fingerprint

OBSERVED RESULTS

Need to enter the PIN

I will attach a video in the next note that shows the steps.

This issue is 100% reproducible on Pixel 8 devices that we have.

Issue 333420619

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