- A
Microsoft Purview Communication Compliance
Why wrong: Incorrect. Microsoft Purview Communication Compliance is used for monitoring communications for policy violations, not for managing external user access or restricting chat initiation.
- B
Teams External Access (Federation)
Why wrong: Incorrect. Teams External Access (Federation) only controls chat and calling between organizations. It does not allow external users to access specific channels, nor does it provide the granular control over channel access required in the scenario.
- C
Microsoft Entra B2B collaboration
Why wrong: Incorrect. Microsoft Entra B2B collaboration is the underlying identity framework for guest users, but the specific Teams feature to configure is Teams Guest Access, which relies on B2B collaboration. The question asks for the feature to configure in Teams.
- D
Teams Guest Access
Correct. Teams Guest Access allows external users to be invited as guests, granting access to specific channels. Guest access policies can be set to prevent guests from starting private chats, fully meeting the requirements.
Teams Guest Access: Limit External Users to Channels
This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: teams Guest Access. 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.
An organization uses Microsoft Teams and wants to ensure that external users from partner companies can access only specific channels and cannot initiate private chats with internal users. Which Microsoft 365 feature should they configure?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Teams Guest Access
D is correct because Teams Guest Access allows external users to be invited as guests in a tenant, granting them access to specific channels and teams. Guest access policies can be configured to prevent guests from initiating private chats with internal users, meeting both requirements. External Access (Federation) only controls chat and calling between federated domains and does not provide access to channels, making option B incorrect.
Key principle: Teams Guest Access
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Microsoft Purview Communication Compliance
Why it's wrong here
Incorrect. Microsoft Purview Communication Compliance is used for monitoring communications for policy violations, not for managing external user access or restricting chat initiation.
- ✗
Teams External Access (Federation)
Why it's wrong here
Incorrect. Teams External Access (Federation) only controls chat and calling between organizations. It does not allow external users to access specific channels, nor does it provide the granular control over channel access required in the scenario.
- ✗
Microsoft Entra B2B collaboration
Why it's wrong here
Incorrect. Microsoft Entra B2B collaboration is the underlying identity framework for guest users, but the specific Teams feature to configure is Teams Guest Access, which relies on B2B collaboration. The question asks for the feature to configure in Teams.
- ✓
Teams Guest Access
Why this is correct
Correct. Teams Guest Access allows external users to be invited as guests, granting access to specific channels. Guest access policies can be set to prevent guests from starting private chats, fully meeting the requirements.
Related concept
Teams Guest Access
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates often assume External Access (Federation) covers all external collaboration scenarios, but it only enables chat and calling between organizations. For channel-level access, guest accounts or shared channels are required, which are part of Guest Access.
Trap categories for this question
Scenario analysis trap
Incorrect. Teams External Access (Federation) only controls chat and calling between organizations. It does not allow external users to access specific channels, nor does it provide the granular control over channel access required in the scenario.
Detailed technical explanation
How to think about this question
Under the hood, Teams External Access uses SIP federation via the Microsoft Teams Federation Service, which relies on DNS SRV records (e.g., _sipfederationtls._tcp.<domain>) to establish trust between tenants. A subtle behavior is that federated users appear as 'External' in the client and cannot be added to teams directly; they must be added to specific channels via the 'Add members' dialog, and their chat capabilities are controlled by the 'Allow federated users to contact me' toggle in the external access settings. In a real-world scenario, a partner company's user can collaborate on a shared channel but cannot see the internal user's presence or start a one-on-one chat unless explicitly allowed.
KKey Concepts to Remember
- Teams Guest Access
- Teams External Access (Federation)
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
Teams Guest Access
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.
What to study next
Got this wrong? Here's your next step.
Review teams Guest Access, then practise related MS-900 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this MS-900 question test?
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Teams Guest Access.
What is the correct answer to this question?
The correct answer is: Teams Guest Access — D is correct because Teams Guest Access allows external users to be invited as guests in a tenant, granting them access to specific channels and teams. Guest access policies can be configured to prevent guests from initiating private chats with internal users, meeting both requirements. External Access (Federation) only controls chat and calling between federated domains and does not provide access to channels, making option B incorrect.
What should I do if I get this MS-900 question wrong?
Review teams Guest Access, then practise related MS-900 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Teams Guest Access
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Last reviewed: Jun 24, 2026
This MS-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-900 exam.
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