React Native Android biometrics - can I locally authenticate using face lock? From what I see, only fingerprint authentication works

I can set a fingerprint and a face unlock on my Android phone and currently I am trying to check if either is available and biometrically authenticate the user in my application.


I am currently using the react-native-biometrics package which supports both TouchID and FaceID for iOS, but only Biometrics for Android. When I do this:
const { biometryType } = await biometrics.isSensorAvailable();



It is only defined if I have a fingerprint unlock set up.
const { success } = await biometrics.simplePrompt({
promptMessage: 'Confirmation',
});



Also only triggers if I have fingerprint unlock set up. It doesn't do anything if I just have face unlock set up.


From what I can see, all React Native libraries that I have found only support fingerprint for Android. I imagine there must be some sort of Android reason for this?