<Account name> is not a valid account name. (Error 3030)

The specified account (user) name is not valid. 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:

• The characters " / \ [ ] | < > + = ; , : ? *
• Leading spaces
• Control characters

User names are not case-sensitive.