React Native на выставке отпечаток пальцев работает, Bt не в APK
if (await LocalAuthentication.isEnrolledAsync() && await LocalAuthentication.isEnrolledAsync()) {
//do biometric auth
} else {
// implement your own password or use another package for device pin.
}
//must USe Async and await to get the response from all function in expo LocalAuthentication
Singh99