Not a valid account name or password. (Error 3029)

You entered an invalid account (user) name or password.

User names

User names can be from 1 to 20 characters long and can include alphabetic characters, accented characters, numbers, spaces, and symbols, with the following exceptions:

User names are not case-sensitive.

Passwords

Passwords can be any combination of 14 or fewer characters; passwords cannot contain control characters. Passwords are case-sensitive.