Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > PowerScale OneFS User Mapping: Mapping Identities Across Authentication Providers > Mapping rules cannot contain a user principal name
You cannot use a user principal name in a user mapping rule. A user principal name (UPN) is an Active Directory domain and username that are combined into an Internet-style name with an @ sign, like an email address: jane@example.com.
If you include a UPN in a rule, the mapping service ignores it and might return an error.