It's more likely that the Android device will respect PreferredCamera.Front

Author: yasirkula

.github/AAR Source (Android)/AndroidManifest.xml

@@ -10,6 +10,7 @@
 
 	<uses-sdk android:targetSdkVersion="4" />
 	<uses-feature android:name="android.hardware.camera" android:required="false" />
+	<uses-feature android:name="android.hardware.camera.front" android:required="false" />
 	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" tools:node="replace" />
 	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" tools:node="replace" />
 	<uses-permission android:name="android.permission.READ_MEDIA_IMAGES" tools:node="replace" />

.github/AAR Source (Android)/java/com/yasirkula/unity/NativeCameraUtils.java

@@ -131,19 +131,25 @@ else if( isXiaomiOrMIUI < 0 )
 	}
 
 	// Credit: https://github.com/jamesmontemagno/MediaPlugin/issues/307#issuecomment-356199135
+	// Credit: https://stackoverflow.com/a/67288087/2373034
 	public static void SetDefaultCamera( Intent intent, boolean useRearCamera )
 	{
 		if( useRearCamera )
 		{
 			intent.putExtra( "android.intent.extras.LENS_FACING_BACK", 1 );
 			intent.putExtra( "android.intent.extras.CAMERA_FACING", 0 );
 			intent.putExtra( "android.intent.extra.USE_FRONT_CAMERA", false );
+			intent.putExtra( "com.google.assistant.extra.USE_FRONT_CAMERA", false );
 		}
 		else
 		{
 			intent.putExtra( "android.intent.extras.LENS_FACING_FRONT", 1 );
 			intent.putExtra( "android.intent.extras.CAMERA_FACING", 1 );
 			intent.putExtra( "android.intent.extra.USE_FRONT_CAMERA", true );
+			intent.putExtra( "com.google.assistant.extra.USE_FRONT_CAMERA", true );
+
+			intent.putExtra( "camerafacing", "front" );
+			intent.putExtra( "default_camera", "1" );
 		}
 	}
 

Plugins/NativeCamera/Android/NativeCamera.aar

@@ -1,4 +1,4 @@
-= Native Camera for Android & iOS (v1.3.6) =
+= Native Camera for Android & iOS (v1.3.7) =
 
 Online documentation & example code available at: https://github.com/yasirkula/UnityNativeCamera
 E-mail: yasirkula@gmail.com

Plugins/NativeCamera/README.txt

@@ -1,7 +1,7 @@
 {
   "name": "com.yasirkula.nativecamera",
   "displayName": "Native Camera",
-  "version": "1.3.6",
+  "version": "1.3.7",
   "documentationUrl": "https://github.com/yasirkula/UnityNativeCamera",
   "changelogUrl": "https://github.com/yasirkula/UnityNativeCamera/releases",
   "licensesUrl": "https://github.com/yasirkula/UnityNativeCamera/blob/master/LICENSE.txt",