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What is a user principal name (UPN)?
What is a UPN in Active Directory?
What is a UPN login name?
What is a UPN attribute?
User Principal Names (UPN) are user attributes on Microsoft Active Directory that serve as an internet-style login for users. Developed based on the Internet standard RFC 822 , UPNs take an email address format, consisting of a username and a domain.
- Overview
- UPN and their changes
- Apps known issues and workarounds
- Managed devices known issues and workarounds
- Mobile Application Management app protection policies
- Microsoft Authenticator known issues and workarounds
- Security key (FIDO2) known issues and workarounds
- OneDrive known issues and workarounds
- Teams Meeting Notes known issues and workarounds
- Next steps
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.
UPN change types
Change the prefix, suffix, or both. •Change the prefix: •BSimon@contoso.com becomes BJohnson@contoso.com •Bsimon@contoso.com becomes Britta.Simon@contoso.com •Changing the suffix: •Britta.Simon@contoso.com becomes Britta.Simon@contosolabs.com, or •Britta.Simon@corp.contoso.com becomes Britta.Simon@labs.contoso.com
UPNs in Active Directory
In Active Directory, the default UPN suffix is the domain DNS name where you created the user account. In most cases, you register this domain name as the enterprise domain. If you create the user account in the contoso.com domain, the default UPN is: username@contoso.com. However, you can add more UPN suffixes by using Active Directory domains and trusts. Learn more: [Add your custom domain name using the Microsoft Entra admin center](~/fundamentals/add-custom-domain.md). For example, if you add labs.contoso.com and change the user UPNs and email to reflect that, the result is: username@labs.contoso.com. Important If you change the suffix in Active Directory, add and verify a matching custom domain name in Microsoft Entra ID. Add your custom domain name using the Microsoft Entra admin center
UPNs in Microsoft Entra ID
Users sign in to Microsoft Entra ID with their userPrincipalName attribute value. When you use Microsoft Entra ID with on-premises Active Directory, user accounts are synchronized by using the Microsoft Entra Connect service. The Microsoft Entra Connect wizard uses the userPrincipalName attribute from the on-premises Active Directory as the UPN in Microsoft Entra ID. You can change it to a different attribute in a custom installation. When you synchronize user accounts from Active Directory to Microsoft Entra ID, ensure the UPNs in Active Directory map to verified domains in Microsoft Entra ID. If the userPrincipalName attribute value doesn't correspond to a verified domain in Microsoft Entra ID, synchronization replaces the suffix with .onmicrosoft.com.
Software as a service (SaaS) and line of business (LoB) applications often rely on UPNs to find users and store user profile information, including roles. Applications potentially affected by UPN changes use just-in-time (JIT) provisioning to create a user profile when users initially sign in to the app.
Learn more:
•What is SaaS?
•What is app provisioning in Microsoft Entra ID?
Microsoft Entra joined devices
Microsoft Entra joined devices are joined to Microsoft Entra ID. Users sign in to the device using their organization identity. Learn more: Microsoft Entra joined devices
Known issues and resolution
Users might experience single sign-on issues with applications that depend on Microsoft Entra ID for authentication. This issue was fixed in the Windows 10 May-2020 update (2004).
Workaround
Allow enough time for the UPN change to sync to Microsoft Entra ID. After you verify the new UPN appears in the Microsoft Entra admin center, ask the user to select the "Other user" tile to sign in with their new UPN. You can verify using Microsoft Graph PowerShell. See, Get-MgUser. After users sign in with a new UPN, references to the old UPN might appear on the Access work or school Windows setting.
Known issues
Your organization might use Mobile Application Management (MAM) to protect corporate data in apps on user devices. MAM app protection policies aren't resilient during UPN changes, which can break the connection between MAM enrollments and active users in MAM integrated applications. This scenario could leave data in an unprotected state. Learn more: •App protection policies overview •Frequently asked questions about MAM and app protection
Workaround
IT admins can wipe data from affected devices, after UPN changes. This forces users to reauthenticate and reenroll with new UPNs. Learn more: How to wipe only corporate data from Intune-managed apps
Your organization might require the Microsoft Authenticator app to sign in and access applications and data. Although a username might appear in the app, the account isn't a verification method until the user completes registration.
Learn more: How to use the Microsoft Authenticator app
Microsoft Authenticator app has four main functions:
•Multifactor authentication with push notification or verification code
•Authentication broker on iOS and Android devices fir SSO for applications using brokered authentication
•Enable cross-app SSO on Android using MSAL
Known issues
When multiple users are registered on the same key, the sign-in screen shows account selection where the old UPN appears. Sign-in with security keys isn't affected by UPN changes.
Workaround
To remove references to old UPNs, users reset the security key and re-register. Learn more: Enable passwordless security key sign-in, Known issue, UPN changes
OneDrive users are known to experience issues after UPN changes.
Learn more: How UPN changes affect the OneDrive URL and OneDrive features
Known issues
When a user UPN changes, meeting notes created under the old UPN are not accessible with Microsoft Teams or the Meeting Notes URL.
Workaround
After the UPN change, users can recover meeting notes by downloading them from OneDrive 1.Go to My Files. 2.Select Microsoft Teams Data. 3.Select Wiki.
•Microsoft Entra Connect: Design concepts
•Microsoft Entra UserPrincipalName population
Jan 2, 2019 · As the name suggests, User Principal Name (UPN) is the name of Office 365 user. This is available in the format of email address. Every new user gets a UPN, which is also their active directory ID (primary email ID). For example, a user named Alice becomes a user of Office 365 domain “tastyicecream” and both her primary email address and ...
Jan 30, 2023 · The UPN or userPrincipalName is the more modern attribute or user naming object introduced with Active Directory in Windows 2000. It is an Internet-style login name for users based on the Internet...
Dec 2, 2020 · UPN, which looks like an email address and uniquely identifies the user throughout the forest (Active Directory attribute name: userPrincipalName) SAM account name, also called the "pre-Windows 2000 logon name," which takes the form domain\user (Active Directory attribute name: sAMAccountName)
Mar 2, 2015 · by Technology Expert. Margaret Rouse. Updated on 2 March 2015. What Does User Principal Name Mean? User Principal Name (UPN) is a term for a username in "email format" for use in Windows Active Directory. Here, the user’s personal username is separated from a domain name by the traditional "@" sign. Advertisements.
Mar 11, 2024 · UserPrincipalName (UPN) is the user’s logon name in the format of an email address, for example, maxb@contoso.com . UPN name doesn’t necessarily have to match the user’s email address. In this case, maxb is the username in an Active Directory domain (user logon name), contoso.com is the UPN suffix. They have a delimiter @ between them.
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