How can I get the X button for stopping on the media style notification on Android P?

I'm trying to show the X on the MediaStyle Notification Android P. I see a lot of posts basically saying this won't work on API 21 and higher I think but here is screenshot of an app showing it:

I've tried this code below but it doesn't show it:

    Notification notification = new NotificationCompat.Builder(getApplicationContext(), TESTID)
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setContentTitle("Track title")
            .setContentText("Artist - Album")
            .addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
            .addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
            .addAction(R.drawable.ic_fast_forward_black_24dp, "fwd", pi)
            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.vectors_525058875))
            .setAutoCancel(false)
            .setStyle(new MediaStyle()
                    .setMediaSession(mediaSessionCompat.getSessionToken()).setShowCancelButton(true).setCancelButtonIntent(pi))
            .build();
    notificationManager.notify(300, notification);

from How can I get the X button for stopping on the media style notification on Android P?