Note that local_auth plugin requires the use of a FragmentActivity as opposed to Activity. This can be easily done by switching to use FlutterFragmentActivity as opposed to FlutterActivity in your manifest (or your own Activity class if you are extending the base class).
- Open
android>app>src>main>AndroidManifest.xml - Add the permission
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.[your.package]">
<uses-permission android:name="android.permission.USE_FINGERPRINT"/>