Non-functional App

I have been trying to login through this mobile app for 3 days now with no luck. I cant sync it to my miles-and-more account, and there is an issue with finding my reservation codes. I have called the airline and everything is valid, and it works through my laptop browser. They even said we guess the app just isnt working which is nice for responsibility but not exactly helpful.

Guy2345 about Lufthansa, v5.0.1