不公开的视频不会播放

Question

我的未上市（不是私人，只是未列出！）视频无法播放。设置了PlayerStateChangeListener，显示视频由于INTERNAL_ERROR而无法播放：

YouTubePlayerSupportFragment fragment = YouTubePlayerSupportFragment.newInstance();      

getChildFragmentManager()
  .beginTransaction()
  .add(R.id.video, fragment)
  .commit();

fragment.initialize(DEVELOPER_KEY, new YouTubePlayer.OnInitializedListener() {
   @Override
   public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer youTubePlayer, boolean b) {
        youTubePlayer.loadVideo(videoIDForVideoMedia(MY_VIDEO_ID));
        youTubePlayer.setPlayerStateChangeListener(new YouTubePlayer.PlayerStateChangeListener() {
           @Override
           public void onLoading() {}

           @Override
           public void onLoaded(String s) {}

           @Override
           public void onAdStarted() {}

           @Override
           public void onVideoStarted() {}

           @Override
           public void onVideoEnded() {}

           @Override
           public void onError(YouTubePlayer.ErrorReason errorReason) {
             Log.e(TAG, errorReason.toString()); // INTERNAL_ERROR right after the video loaded
           }
        });

        // etc...

可以找到有关错误的更多信息here。

到目前为止，我为MY_VIDEO_ID设置的所有公开视频ID都没有任何问题。有没有人成功播放过不公开的视频？