Android/src/unityLibrary/xrmanifest.androidlib/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.UnityTechnologies.XR.Manifest">
  <application>
    <activity android:name="com.unity3d.player.UnityPlayerActivity">
    </activity>
  </application>
</manifest>