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In Windows Active Directory, a User Principal Name (UPN) is the name of a system user in an email address format. A UPN (for example: john.doe@domain.com) consists of the user name (logon name), separator (the @ symbol), and domain name (UPN suffix). Important A UPN is not the same as an email address.

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The User Principal Name (UPN) attribute is an internet communication standard for user accounts. A UPN consists of a prefix (user account name) and a suffix (DNS domain name). The prefix joins the suffix using the "@" symbol. For example, someone@example.com. Ensure the UPN is unique among security principal objects in a directory forest.

In Microsoft Active Directory, a User Principal Name (UPN) is a username and domain in an email address format. In a UPN, the username is followed by a separator "at sign" ( @) followed by the active directory's internet domain. An example UPN is tomw@corp.techtarget.com.

UPN format. A UPN consists of a UPN prefix (the user account name) and a UPN suffix (a DNS domain name). The prefix is joined with the suffix using the "@" symbol. For example, "someone@example.com". A UPN must be unique among all security principal objects within a directory forest. UPN in Microsoft Entra ID