The only way login works is jumping through hoops. First you must log in through your regular browser separately. Then load the app and when you get the dreaded blank screen, tap the 3 button menu on the right and choose open in browser (instead of the in app browser), it should then redirect the authorization link and sign you in through the app. Devs need to fix or change the in-app browser because a large majority won't be able to figure this out.