Finally earn a free McCafe Drink, now the app wont open

The app has a buy 5 get one free deal. I Finally earn a free McCafe Drink, now the app wont open, it gives me an error to check for a new update. I HAVE the latest update! This is a complete bait and switch. D-O-N-E with McDonalds. Its 2017, there are plenty of options (cheaper, better tasting, healthier) in quick food on the go. Crossing McDonalds OFF my list.

iPhone Honey Badger about McDonald's, v5.5.1