The correct configuration is to use the Authentication methods policy to require mobile phone registration for guest users. This works because the Authentication methods policy in Microsoft Entra ID controls which verification methods are available and enforced for all users, including guests; by targeting this policy specifically at guest users and mandating mobile phone registration, you ensure that every external collaborator must provide a phone number before accessing resources. On the MS-102 exam, this scenario tests your understanding of how authentication policies differ from conditional access policies—a common trap is confusing the Authentication methods policy (which enforces registration) with a conditional access policy (which controls access after registration). Remember that registration enforcement lives in the Authentication methods blade, not in Conditional Access. A helpful memory tip: “Methods mandate, Conditional controls”—the policy that mandates what you must register is always the Authentication methods policy.
MS-102 Practice Question: Implement and manage Microsoft Entra identity and access
This MS-102 practice question tests your understanding of implement and manage microsoft entra identity and access. 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 uses Microsoft Entra ID and requires that all guest users must have a mobile phone number registered for authentication. You need to enforce this requirement. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the Authentication methods policy to require mobile phone registration for guests.
Option C is correct because the Authentication methods policy in Microsoft Entra ID allows you to define which authentication methods are available to users, including guest users. By configuring this policy to require mobile phone registration, you enforce that all guest users must register a mobile phone number for authentication, directly addressing the requirement.
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.
✗
Create a Terms of Use policy that guests must accept.
Why it's wrong here
Terms of Use only require acceptance, not registration of a specific method.
✗
Configure a Conditional Access policy requiring multifactor authentication for guest users.
Why it's wrong here
Conditional Access controls access, not registration of specific methods.
✓
Configure the Authentication methods policy to require mobile phone registration for guests.
Why this is correct
Authentication methods policy can require specific methods to be registered.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create an access review for guest users in Identity Governance.
Why it's wrong here
Access reviews review access, not enforce registration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse requiring multifactor authentication (MFA) with requiring a specific authentication method (mobile phone), but MFA can be satisfied by other methods like email OTP or authenticator app, whereas the Authentication methods policy directly mandates registration of a mobile phone number.
Detailed technical explanation
How to think about this question
The Authentication methods policy in Microsoft Entra ID uses the Graph API to manage registration and usage of methods like phone (SMS/voice call), email OTP, and Microsoft Authenticator. When you set the 'Phone' method to 'Enabled' and target it to guest users, they are prompted to register a phone number during their next sign-in; this policy can be scoped to specific user groups, including 'All guest users' via the 'Include' target. Under the hood, the policy enforces registration by checking the user's authentication methods during token issuance and blocking sign-in if the required method is not registered.
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.
Implement and manage Microsoft Entra identity and access — This question tests Implement and manage Microsoft Entra identity and access — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the Authentication methods policy to require mobile phone registration for guests. — Option C is correct because the Authentication methods policy in Microsoft Entra ID allows you to define which authentication methods are available to users, including guest users. By configuring this policy to require mobile phone registration, you enforce that all guest users must register a mobile phone number for authentication, directly addressing the requirement.
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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