is not a valid account name. (Error 3030)
Applies to: Access 2013 | Access 2016
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 " / \ [ ] | < > + = ; , : ? *
User names are not case-sensitive.