Typically, when you log in to a website for the first time, the browser stores your username and password. Consequently, the next time you access the website, your username and password is pre-filled into the login page for you.
If you attempt to log in to the User Portal on a BlackBerry device with a username and password that has been pre-filled into the login page, the login fails. To log in to the User Portal on a BlackBerry device, you need to manually enter your username and password.