title: Why has sentiment analysis been turned off in our LUIS apps?
body: <p>Support help needed: A few weeks ago we discovered the shape of the sentiment json object had changed without notice, breaking our code. Now it's breaking again because the entire sentiment object is missing. After investigating in our LUIS app, it turns out the sentiment setting has been turned off in our manage portal, and it is no longer accessible (I can't turn it back on).  What is happening with sentiment?</p>