The correct first step is to add the domain in the Microsoft 365 admin center. This action is essential because the admin center generates a unique TXT verification record that must be placed in the public DNS zone of the new domain, proving ownership before any services can be configured. On the MS-102 exam, this question tests your understanding of the domain verification workflow, which is a foundational task for hybrid and multi-domain environments. A common trap is assuming you can directly update DNS records or add users first, but without initiating the domain addition in the admin center, you won’t have the specific verification token required. Remember the sequence: Admin Center first, then DNS record, then verification. A helpful memory tip is “Add to Admin, then add to DNS”—the admin center always generates the key you need to prove you own the second custom domain.
MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has an existing Microsoft 365 tenant with the verified custom domain 'contoso.com'. The administrator now wants to add a second custom domain, 'contoso-europe.com', to the same tenant. What is the first step the administrator should take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the domain in the Microsoft 365 admin center.
The first step to add a second custom domain to an existing Microsoft 365 tenant is to initiate the domain addition process in the Microsoft 365 admin center. This triggers the system to generate the unique TXT verification record that must be added to the public DNS zone to prove ownership of the domain. Without first adding the domain in the admin center, the administrator would not know the specific verification value required for the DNS record.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Add the domain in the Microsoft 365 admin center.
Why this is correct
The domain must first be added to the Microsoft 365 tenant to begin the verification process.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a TXT verification record in the public DNS zone for 'contoso-europe.com'.
Why it's wrong here
This is the second step; the TXT record is required only after the domain is added and the verification token is provided.
✗
Add an MX record pointing to Exchange Online in the public DNS zone for 'contoso-europe.com'.
Why it's wrong here
MX records are for mail routing and are configured after domain ownership is verified, not as the first step.
✗
Contact Microsoft support to enable the domain addition feature.
Why it's wrong here
No support contact is needed; any global administrator can add a custom domain directly in the admin center.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the first step is to create a DNS record (like TXT or MX) directly, but the correct sequence requires initiating the domain addition in the admin center first to obtain the necessary verification value.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft 365 uses the Domain Ownership Verification protocol (RFC 8555-style) where the admin center generates a unique TXT record value (e.g., 'MS=msXXXXXXXX') that must be published in the domain's public DNS. The system then polls the DNS to confirm the record exists before marking the domain as verified. A subtle behavior is that the TXT record must be added exactly as provided, including case sensitivity, and DNS propagation delays can cause verification to fail if checked too quickly.
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.
TExam Day Tips
→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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the domain in the Microsoft 365 admin center. — The first step to add a second custom domain to an existing Microsoft 365 tenant is to initiate the domain addition process in the Microsoft 365 admin center. This triggers the system to generate the unique TXT verification record that must be added to the public DNS zone to prove ownership of the domain. Without first adding the domain in the admin center, the administrator would not know the specific verification value required for the DNS record.
What should I do if I get this MS-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Variation 1. Your company is deploying Microsoft 365 for a new subsidiary with 500 users. You need to configure the initial tenant with a custom domain (contoso.com) and verify ownership. What is the first step you must perform?
easy
A.Delegate the contoso.com zone to Microsoft 365 DNS servers.
B.Create user accounts with the custom domain before verification.
✓ C.Add a TXT record provided by Microsoft 365 to the contoso.com DNS zone.
D.Set contoso.com as the default domain in the Microsoft 365 admin center.
Why C: To verify ownership of a custom domain in Microsoft 365, you must prove you control the domain's DNS zone. Microsoft provides a unique TXT record value that you add to the public DNS zone of contoso.com. Once the TXT record propagates, Microsoft queries it and confirms ownership, allowing you to proceed with domain configuration.
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Question Discussion
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