Can't log in on Android App

[dandrei279]

Plan

Free

Device

Samsung Galaxy S6

Operating System

Android 7.0

My Question or Issue

 I can't log in on my Android phone. In the log in form, I press the "Log in" button and the text changes to "Logging in" and the back to "Log in" and nothing happens. I can confirm that the username and the password are correct and there is no warning about user/password missmatch. I've tried reinstalling the app, changing the password, force stop, clear cache but it is still not working. On desktop I can log in with no problem.