The correct answer is to remove the domain from the source tenant and add it to the target tenant, then migrate users. This works because a primary domain like contoso.com can only be verified and associated with a single Microsoft 365 tenant at a time, so you must first unregister it from the old tenant before adding it to the new one, which preserves user email addresses during the tenant-to-tenant migration. On the MS-102 exam, this scenario tests your understanding of domain consolidation and cross-tenant mailbox migration, often appearing as a trick where candidates confuse federation trusts or cross-tenant collaboration with actual domain merging. A common trap is assuming you can share a domain across tenants, but Microsoft does not allow that—each domain is exclusive to one tenant. Remember the key rule: one domain, one tenant, so remove first, add second, then migrate.
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.
Your company recently merged with another company that uses Microsoft 365. Both tenants have the same primary domain, contoso.com. You need to merge the two tenants into a single tenant while preserving user email addresses. What should you do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove the domain from the source tenant and add it to the target tenant, then migrate users.
Option C is correct because tenant-to-tenant migration with domain consolidation involves adding the domain to the target tenant and then migrating users with their email addresses. Option A is wrong because a federation trust does not allow merging tenants. Option B is wrong because domain sharing is not possible. Option D is wrong because cross-tenant collaboration does not consolidate domains.
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.
✗
Use cross-tenant collaboration settings to share the domain.
Why it's wrong here
Cross-tenant collaboration does not allow domain sharing.
✓
Remove the domain from the source tenant and add it to the target tenant, then migrate users.
Why this is correct
Standard approach for tenant consolidation.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a domain sharing agreement between both tenants.
Why it's wrong here
Domain sharing is not supported in Microsoft 365.
✗
Set up a federation trust between the two tenants.
Why it's wrong here
Federation trust is for authentication, not domain consolidation.
Common exam traps
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.
Detailed technical explanation
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.
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.
Identify which MS-102 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Remove the domain from the source tenant and add it to the target tenant, then migrate users. — Option C is correct because tenant-to-tenant migration with domain consolidation involves adding the domain to the target tenant and then migrating users with their email addresses. Option A is wrong because a federation trust does not allow merging tenants. Option B is wrong because domain sharing is not possible. Option D is wrong because cross-tenant collaboration does not consolidate domains.
What should I do if I get this MS-102 question wrong?
Identify which MS-102 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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