Rubbish app. Slow, buggy. Notification comes up saying mobile key is ready and mobile key doesn't appear in the app. Such low quality application shall not be allowed by Mariott to even exist. Shame. Learn from Hilton what mobile key is and how to use it. I can't belive you can't hire capable developers. Some primary school grade level developers could not master to ensure mobile key works if you booked more than one app via this app. It is like Mariott doesn't appreciate customers paying more