Trailing spaces in the username field should be deleted. I was having problems logging in and it took a moment to realize the problem since it was working fine on mobile. On Android, and I think on iOS as well, the keyboards will add a space to end of words by default. I was tapping in the keyboard suggestion for my username and it also added a space afterwards. When I tapped on login, the process included the space, which resulted failure to login. Not sure if having a username property to the field on Connect would help with the Google keyboard in not adding the space.