(Android, iOS) Understanding Fingerprint Authentication
Users can choose fingerprint authentication instead of a passcode to unlock the datavault.
When multiple user support is enabled, fingerprint authentication cannot be used.
When developing your application, keep in mind that fingerprint authentication requires the following device conditions.
The user's fingerprint must be configured and saved in the device's operation system settings.
(iOS) Fingerprint authentication is available on devices that have Touch ID capability, and are running iOS 9 or higher.
(Android) Fingerprint authentication is available on devices that have fingerprint authentication capability and are running Android 6.0 or higher.