Issues can sometimes arise when:
- Copying/pasting your info. Try instead manually typing in your email and password.
- Make sure your email address is all lowercase.
- Using a password helper app. Again try entering your password in manually.
- Using a connected keyboard. Try instead using the iPad onscreen keyboard.
- Using the TAB key to switch from the email field to the password field. Try tapping into the password field instead.
- Does your password have spaces in it? Reset your password to one without spaces.
If it still doesn't work, contact support via the Submit A Request link at the top of the page.