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An organization has just purchased Microsoft 365 Business Standard licenses and has added the custom domain 'contoso.com' to the tenant. The administrator wants all new user email addresses to use '@contoso.com' instead of the default '@contoso.onmicrosoft.com'. How can this be achieved?

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An organization has just purchased Microsoft 365 Business Standard licenses and has added the custom domain 'contoso.com' to the tenant. The administrator wants all new user email addresses to use '@contoso.com' instead of the default '@contoso.onmicrosoft.com'. How can this be achieved?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Best answer

Set the default domain in the Microsoft 365 admin center to contoso.com

Correct. Changing the default domain ensures new users use @contoso.com automatically.

B

Distractor review

Change the primary SMTP address for each user manually after creation

Incorrect. This is possible but not efficient or automatic; the default domain method is simpler.

C

Distractor review

Remove the onmicrosoft.com domain from the tenant

Incorrect. The initial onmicrosoft.com domain cannot be removed from the tenant.

D

Distractor review

Edit the user creation PowerShell script to specify the domain

Incorrect. While PowerShell can be used, it is not the standard configuration change; setting the default domain is preferred.

Common exam trap

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Technical deep dive

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A company recently added the custom domain 'contoso.com' to their Microsoft 365 tenant. Users report that they cannot receive external email sent to their new domain addresses. The administrator confirmed that the domain status shows 'Active' in the Microsoft 365 admin center. What is the most likely cause of this issue?

Question 2

A company has 500 users across Sales, Marketing, and IT departments. User objects are synced from on-premises Active Directory to Microsoft Entra ID using Azure AD Connect. Each department requires different Microsoft 365 license plans (e.g., Sales needs E3, Marketing needs Business Premium, IT needs E5). The administrator wants to automatically assign the appropriate license based on the department attribute without manual intervention. Which approach should the administrator use?

Question 3

A company has purchased 1000 Microsoft 365 E5 licenses and wants to automatically assign licenses to users based on their department attribute, which is synchronized from on-premises Active Directory. The department attribute is stored in Azure AD. Which automated method should the administrator use to achieve this?

Question 4

A company has just purchased Microsoft 365 Business Standard and added the custom domain 'fabrikam.com' to the tenant. They want to verify domain ownership. Which DNS record type must they add to their DNS provider?

Question 5

A company plans to migrate their email from an on-premises Exchange server to Exchange Online. They want to ensure that during the migration, mail sent to users who have already been migrated is delivered to Exchange Online, while mail for non-migrated users is delivered to on-premises. Which type of domain configuration should they use?

Question 6

A company has registered the custom domain 'contoso.com' and wants to host email for the subdomain 'sales.contoso.com' in Exchange Online. They have already verified the root domain. What additional step is required?

FAQ

Questions learners often ask

What does this MS-102 question test?

Read the scenario before looking for a memorised answer.

What is the correct answer to this question?

The correct answer is: Set the default domain in the Microsoft 365 admin center to contoso.com — By setting the custom domain as the default domain in the Microsoft 365 admin center (under Domains), all new users will automatically receive an email address with that domain. Manually changing each user's address is inefficient. The onmicrosoft.com domain cannot be removed. While a PowerShell script could be used, the built-in admin center method is the intended solution.

What should I do if I get this MS-102 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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