The answer is to configure cross-tenant access settings in Azure AD to allow the subsidiary’s tenant to access the main tenant’s resources. This is required because SharePoint Online enforces tenant-level access policies that block users from a different tenant, even after they are added to the main tenant’s Azure AD and assigned licenses; cross-tenant access settings explicitly authorize the subsidiary’s identity provider to authenticate against the main tenant’s resources. On the MS-102 exam, this scenario tests your understanding of Azure AD External Identities and cross-tenant collaboration, often appearing as a trap where candidates mistakenly focus on license assignment or SharePoint permissions instead of the foundational tenant trust. A common memory tip is “trust before access”—you must establish cross-tenant trust in Azure AD before any SharePoint site can recognize migrated users.
MS-102 Manage users, groups, licensing, and support Practice Question
This MS-102 practice question tests your understanding of manage users, groups, licensing, and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are a Microsoft 365 administrator for a medium-sized company with 500 users. The company uses Microsoft 365 E3 licenses. Recently, the company acquired a small subsidiary with 50 users who already have their own Microsoft 365 tenant with E3 licenses. You need to migrate the subsidiary's users to the main tenant while minimizing downtime and ensuring that users retain their existing email and OneDrive data. You plan to use cross-tenant migration. However, after setting up the migration, you notice that the subsidiary's users cannot access the main tenant's SharePoint Online sites. They receive an access denied error. You verify that the users have been added to the main tenant's Azure AD and are assigned licenses. What should you do to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure cross-tenant access settings in Azure AD to allow the subsidiary's tenant to access the main tenant's resources.
Option D is correct because cross-tenant migration in Microsoft 365 requires explicit cross-tenant access settings in Azure AD to allow users from the subsidiary's tenant to access resources in the main tenant, such as SharePoint Online. Without configuring these settings, the subsidiary's users will receive access denied errors even after being added to the main tenant's Azure AD and assigned licenses, as SharePoint enforces tenant-level access policies.
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.
✗
Re-run the cross-tenant migration and select the option to convert users to mail-in-contact.
Why it's wrong here
Converting to mail-contact would not grant SharePoint access.
✗
In the SharePoint admin center, add the subsidiary's domain as an allowed domain for sharing.
Why it's wrong here
This allows sharing, but the users are now internal; cross-tenant access is still needed for migration.
✗
Assign the users a new license from the main tenant's subscription.
Why it's wrong here
Licenses are already assigned; the issue is access policy.
✓
Configure cross-tenant access settings in Azure AD to allow the subsidiary's tenant to access the main tenant's resources.
Why this is correct
Cross-tenant access policies control how external users access resources.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse cross-tenant migration with simple user addition and assume that assigning a license or adjusting sharing settings resolves access, when in fact Azure AD cross-tenant access settings are mandatory for SharePoint Online resource access after migration.
Detailed technical explanation
How to think about this question
Cross-tenant access settings in Azure AD use the 'Cross-tenant access' blade under 'External Identities' to define inbound and outbound trust policies, including application access controls for services like SharePoint Online. Under the hood, these settings configure OAuth 2.0 token issuance and validation between tenants, ensuring that a user from the subsidiary tenant can authenticate and receive a token that the main tenant's SharePoint Online resource accepts. In a real-world scenario, failing to configure these settings is a common oversight because administrators assume that adding users to the target tenant's Azure AD is sufficient, but SharePoint requires explicit cross-tenant trust to honor the user's home tenant identity.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Manage users, groups, licensing, and support — This question tests Manage users, groups, licensing, and support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure cross-tenant access settings in Azure AD to allow the subsidiary's tenant to access the main tenant's resources. — Option D is correct because cross-tenant migration in Microsoft 365 requires explicit cross-tenant access settings in Azure AD to allow users from the subsidiary's tenant to access resources in the main tenant, such as SharePoint Online. Without configuring these settings, the subsidiary's users will receive access denied errors even after being added to the main tenant's Azure AD and assigned licenses, as SharePoint enforces tenant-level access policies.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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