SC-900 Describe the capabilities of Microsoft Entra Practice Question
Your organization implements a Microsoft Entra ID tenant with a custom domain (contoso.com). You need to ensure that all users are assigned a unique user principal name (UPN) based on their email address. What should you do?
⚠ Common exam trap
It's easy for candidates to confuse verifying a custom domain (Option B) with automatically assigning UPNs based on email addresses, but verification alone does not change how UPNs are generated; it only enables the domain to be used as a suffix.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the user naming attribute to use the email address as the UPN
To ensure users are assigned a UPN based on their email address in Microsoft Entra ID, administrators must manually set the UPN during user creation or modification. For new users, this involves entering the desired email address (or its prefix) as the 'User name' and selecting the appropriate custom domain suffix. For existing users, their UPNs can be updated in bulk using PowerShell or the Microsoft Entra admin center's bulk operations feature to match their email addresses. While there isn't a single 'user naming attribute' setting that automates this process globally, the action of configuring the UPN for each user to match their email address is the necessary step.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the user naming attribute to use the email address as the UPN
Why this is correct
Setting the UPN to email ensures each user has a unique UPN based on email.
- ✗
Verify the custom domain in Microsoft Entra ID
Why it's wrong here
Verification allows using custom domain but does not enforce UPN format.
- ✗
Enable Microsoft Entra ID Domain Services
Why it's wrong here
Not relevant to UPN assignment.
- ✗
Use Microsoft Entra ID Connect to sync UPNs from on-premises
Why it's wrong here
Does not guarantee uniqueness if on-premises UPNs are not unique.
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Microsoft Entra ID
Key term
Organization
An Organization is a top-level container in Google Cloud that represents your company or entities and serves as the root node for all your cloud resources, policies, and access control.
Key term
Custom domain
A custom domain is a personalized internet address (like contoso.com) that you can use with cloud services instead of the default domain provided by the service provider.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SC-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-900 exam.