Alright, my 2 cents here. I had this problem for a few days and I did everything like uninstalling/reinstalling, restarting my phone (android), changing to a PIN instead of a password, trying to log in through my phone's browser instead of the app, the whole 9 yards. In my case, what did the trick was changing my internet access: I went from the mobile data that I had, to trying with a WiFi connection. So I tried logging in with my WiFi connection on my phone, and it worked. Then I went back to my mobile data and it (finally) worked fine. Basically, just try switching between your mode of online connectivity and it might work for you; it did for me.
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