Microsoft SQL Server database ranks third in the relational database, second only to Oracle and MySQL database. when using it, it is inevitable to encounter various problems and warnnings. You may be dba or a developer, I hope this content can help you solve SQL Server error number 14520.

Error number: 14520

Severity level: 16

Event logged: %s is not a valid SQL Server standard login, Windows NT user, Windows NT group, or msdb database role.