Terrible app

The Discovery app has been a problem for a while now, at least 2 months. It crashes when I open it. I can no longer retrieve my rewards vouchers because of it. I use an Huawei P9 which uses Android Nougat. Ever since they did an update it no longer works. Why has the developers not sorted this out yet? If they can't, why can't we access voucher through the website? The fact that this has been a problem for a while, indicates that the app will never work properly for newer android versions. I see many people are having this problem.