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MS-102 · Question #58

You have a Microsoft 365 E5 subscription that contains the following user: Name: User1 UPN: [email protected] Email address: [email protected] MFA enrollment status: Disabled When User1…

The correct answer is D. Modify the UPN of User1. User1 cannot sign in using their email address because Azure AD authentication primarily uses the User Principal Name (UPN), which is currently different.

Submitted by kim_seoul· Apr 18, 2026Implement and manage Microsoft Entra identity and access

Question

You have a Microsoft 365 E5 subscription that contains the following user:

Name: User1 UPN: [email protected] Email address: [email protected] MFA enrollment status: Disabled When User1 attempts to sign in to Outlook on the web by using the [email protected] email address, the user cannot sign in. You need to ensure that User1 can sign in to Outlook on the web by using [email protected]. What should you do?

Options

  • AAssign an MFA registration policy to User1.
  • BReset the password of User1.
  • CAdd an alternate email address for User1.
  • DModify the UPN of User1.

How the community answered

(32 responses)
  • A
    6% (2)
  • B
    13% (4)
  • C
    3% (1)
  • D
    78% (25)

Why each option

User1 cannot sign in using their email address because Azure AD authentication primarily uses the User Principal Name (UPN), which is currently different.

AAssign an MFA registration policy to User1.

Assigning an MFA registration policy would address multi-factor authentication requirements but would not resolve the fundamental issue of the user trying to sign in with an email address that does not match their User Principal Name.

BReset the password of User1.

Resetting the password would only change the credential for the existing UPN ([email protected]) and would not enable sign-in with [email protected].

CAdd an alternate email address for User1.

Adding an alternate email address would just provide another email alias for receiving mail and would not change the User Principal Name used for sign-in authentication.

DModify the UPN of User1.Correct

User authentication in Azure AD primarily relies on the User Principal Name (UPN), so for User1 to sign in successfully to Outlook on the web using [email protected], their UPN must be modified to match that address.

Concept tested: Azure AD User Principal Name (UPN) for sign-in

Source: https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-userprincipalname

Topics

#User Principal Name (UPN)#Microsoft Entra ID#User sign-in#Identity management

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