This SC-900 practice question tests your understanding of describe the capabilities of microsoft entra. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 organization requires that all external guest users must sign in using Microsoft Authenticator for MFA. What should you configure?
Conditional Access policy
Conditional Access can require MFA for guest users.
Microsoft Entra B2B collaboration settings
Why wrong: B2B settings manage invitation and external identities, not MFA enforcement.
Access reviews
Why wrong: Access reviews review access, not enforce MFA.
ID Protection policies
Why wrong: ID Protection policies are risk-based, not MFA requirement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Conditional Access policy
A Conditional Access policy is the correct choice because it allows you to enforce MFA requirements for specific users, including external guest users, based on conditions such as sign-in risk, location, or device state. By targeting the 'Guest or external users' directory role in a Conditional Access policy, you can require Microsoft Authenticator as the MFA method, overriding default settings. This provides granular control over authentication behavior for B2B collaboration guests.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Conditional Access policy
Why this is correct
Conditional Access can require MFA for guest users.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Entra B2B collaboration settings
Why it's wrong here
B2B settings manage invitation and external identities, not MFA enforcement.
Access reviews
Why it's wrong here
Access reviews review access, not enforce MFA.
ID Protection policies
Why it's wrong here
ID Protection policies are risk-based, not MFA requirement.
Common exam traps
The trap here is that candidates confuse the high-level B2B collaboration settings (which only control trust of MFA from the home tenant) with the ability to enforce a specific MFA method directly on guest users, which requires a Conditional Access policy.
Detailed technical explanation
Conditional Access policies use grant controls to enforce 'Require multi-factor authentication,' and when combined with an authentication strength policy (e.g., 'MFA with Microsoft Authenticator'), you can mandate a specific method. Under the hood, this leverages the Microsoft Entra authentication methods policy, which defines which MFA methods are allowed for the tenant. A real-world scenario: if you need to ensure external guests use a phishing-resistant MFA method like Microsoft Authenticator (push notification or OTP), you must create a Conditional Access policy targeting guest users and assign an authentication strength that excludes less secure methods like SMS or voice.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Describe the capabilities of Microsoft Entra — This question tests Describe the capabilities of Microsoft Entra — Read the scenario before looking for a memorised answer..
The correct answer is: Conditional Access policy — A Conditional Access policy is the correct choice because it allows you to enforce MFA requirements for specific users, including external guest users, based on conditions such as sign-in risk, location, or device state. By targeting the 'Guest or external users' directory role in a Conditional Access policy, you can require Microsoft Authenticator as the MFA method, overriding default settings. This provides granular control over authentication behavior for B2B collaboration guests.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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