Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
After adding a custom domain name to a Microsoft 365 tenant, what is the first step the administrator must complete before users can sign in using the custom domain?
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
Distractor review
Add the domain as an accepted domain in Exchange Online
Adding the domain as an accepted domain is part of email configuration, but it requires the domain to be verified first. Verification takes precedence.
B
Distractor review
Set the custom domain as the default domain for new users
Setting the default domain is a subsequent step after verification. The domain cannot be set as default until ownership is confirmed.
C
Best answer
Verify domain ownership by adding a DNS TXT record
Microsoft requires a TXT record verification to prove control over the domain. This is the first mandatory step. After verification, other configurations like email setup become possible.
D
Distractor review
Create user accounts with usernames ending with the custom domain
User accounts cannot be created with the custom domain until verification is complete. Attempting to do so will fail.
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.
Related practice questions
Related MS-102 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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: Verify domain ownership by adding a DNS TXT record — Domain ownership must be verified by adding a specific DNS TXT record provided by Microsoft. Until verification is successful, the domain cannot be used for email routing or user sign-in. All other steps depend on this verification.
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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