I have a big problem with the app.
when I try to sign in, I entered my username and password but each time I click "sign in" it does nothing
I had a problem, previously, with accepting an invitation to an airline where I couldn't click anything.
I could record the screen for you with dev mode on for touches, surface updates, GPU updates etc if you need and send them to you.
Xiaomi Redmi 4A - Android 6.0.1 - Build MMb29M