MS-900 Describe Microsoft 365 apps and services Practice Question
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. 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.
Exhibit
Refer to the exhibit.
```json
{
"displayName": "Block access for non-Microsoft Entra ID users",
"state": "enabled",
"conditions": {
"applications": {
"includeApplications": ["Office365"]
},
"users": {
"includeUsers": ["All"]
}
},
"grantControls": {
"builtInControls": ["mfa", "compliantDevice"]
}
}
```
Refer to the exhibit. You have a Conditional Access policy as shown. A user reports they cannot access Exchange Online from a non-compliant device. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The device is not marked as compliant
The Conditional Access policy shown requires device compliance for Exchange Online access. When a device is non-compliant, the policy blocks access regardless of user identity or MFA status. The most likely reason for the user's inability to access Exchange Online is that the device is not marked as compliant, which is the condition explicitly enforced by the policy.
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.
✓
The device is not marked as compliant
Why this is correct
The grant control requires a compliant device.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The policy only applies to administrators
Why it's wrong here
The policy includes all users.
✗
The user has not registered for MFA
Why it's wrong here
MFA is required, but non-compliant device is the immediate issue.
✗
The policy is disabled
Why it's wrong here
The policy state is enabled.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume MFA or admin-only scoping is the issue, but the policy explicitly targets device compliance, which is the direct cause of the block.
Detailed technical explanation
How to think about this question
Conditional Access policies evaluate device compliance via Microsoft Intune or Microsoft Entra ID (formerly Azure AD) device registration. Non-compliant devices are blocked at the token issuance layer — the user may still authenticate but receives an access denied token. In real-world scenarios, administrators often combine device compliance with location or risk policies to enforce granular access control.
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-900 question in full detail.
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The device is not marked as compliant — The Conditional Access policy shown requires device compliance for Exchange Online access. When a device is non-compliant, the policy blocks access regardless of user identity or MFA status. The most likely reason for the user's inability to access Exchange Online is that the device is not marked as compliant, which is the condition explicitly enforced by the policy.
What should I do if I get this MS-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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