- A
The Key Vault access policy does not grant the Azure Disk Encryption service principal the 'unwrap key' and 'wrap key' permissions.
Correct. ADE requires the Azure Disk Encryption service principal to have these permissions to wrap and unwrap the disk encryption key using the KEK.
- B
The Key Vault firewall is blocking the Azure platform.
Why wrong: Incorrect. While a firewall can block access, the error message specifically mentions lack of permissions, not network connectivity. The question does not indicate firewall is enabled.
- C
The VM does not have a managed identity assigned.
Why wrong: Incorrect. Azure Disk Encryption does not require a managed identity on the VM. It uses the Azure Disk Encryption service principal (a platform identity) to access Key Vault.
- D
The KEK is in a different Azure region than the VM.
Why wrong: Incorrect. Cross-region KEK is supported, though best practice is same region. It would not cause a permission error.
Quick Answer
The answer is that the Key Vault access policy is missing the 'unwrap key' and 'wrap key' permissions for the Azure Disk Encryption service principal. This is the most likely missing configuration because Azure Disk Encryption (ADE) uses a Key Encryption Key (KEK) to protect the disk encryption keys, and the service principal must have these specific cryptographic permissions to encrypt and decrypt the keys during the enablement process. Without them, the disk encryption fails even when soft-delete and a KEK are correctly configured. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your understanding of how Azure Disk Encryption interacts with Key Vault access policies, often appearing as a trap where candidates assume soft-delete or key rotation is the issue. A common memory tip is to remember that ADE needs to "unwrap" the KEK to use it and "wrap" the disk encryption key for protection—think of it as the service needing both hands to lock and unlock the encryption.
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. 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.
A company is enabling Azure Disk Encryption (ADE) on Windows virtual machines. They have enabled soft-delete on Azure Key Vault and configured a Key Encryption Key (KEK). However, the disk encryption fails with an error indicating that the key vault does not have the required permissions. What is the most likely missing configuration?
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 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
The Key Vault access policy does not grant the Azure Disk Encryption service principal the 'unwrap key' and 'wrap key' permissions.
Azure Disk Encryption (ADE) requires the Azure Disk Encryption service principal (also known as the Azure Disk Encryption service) to have 'unwrap key' and 'wrap key' permissions on the Key Vault. These permissions allow the service to encrypt and decrypt the disk encryption keys using the Key Encryption Key (KEK). Without these specific cryptographic permissions, the encryption operation fails, even if soft-delete and a KEK are correctly configured.
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 Key Vault access policy does not grant the Azure Disk Encryption service principal the 'unwrap key' and 'wrap key' permissions.
Why this is correct
Correct. ADE requires the Azure Disk Encryption service principal to have these permissions to wrap and unwrap the disk encryption key using the KEK.
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 Key Vault firewall is blocking the Azure platform.
Why it's wrong here
Incorrect. While a firewall can block access, the error message specifically mentions lack of permissions, not network connectivity. The question does not indicate firewall is enabled.
- ✗
The VM does not have a managed identity assigned.
Why it's wrong here
Incorrect. Azure Disk Encryption does not require a managed identity on the VM. It uses the Azure Disk Encryption service principal (a platform identity) to access Key Vault.
- ✗
The KEK is in a different Azure region than the VM.
Why it's wrong here
Incorrect. Cross-region KEK is supported, though best practice is same region. It would not cause a permission error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the required permissions for ADE with general Key Vault access policies (e.g., 'get' and 'list') or mistakenly think a managed identity or firewall configuration is the root cause, rather than recognizing the need for explicit 'wrap key' and 'unwrap key' permissions for the Azure Disk Encryption service principal.
Detailed technical explanation
How to think about this question
Under the hood, ADE leverages the BitLocker Drive Encryption feature on Windows. When a KEK is used, the service principal first wraps the disk encryption key (DEK) using the KEK via the 'wrap key' operation, and during decryption, it uses 'unwrap key' to retrieve the DEK. These operations require the 'unwrap key' and 'wrap key' permissions on the Key Vault's access policy, distinct from 'get', 'list', or 'decrypt' permissions. In a real-world scenario, if an organization uses a separate Key Vault for keys versus secrets, forgetting to grant these specific cryptographic permissions to the Azure Disk Encryption service principal is a common misconfiguration.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Secure compute, storage, and databases — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Key Vault access policy does not grant the Azure Disk Encryption service principal the 'unwrap key' and 'wrap key' permissions. — Azure Disk Encryption (ADE) requires the Azure Disk Encryption service principal (also known as the Azure Disk Encryption service) to have 'unwrap key' and 'wrap key' permissions on the Key Vault. These permissions allow the service to encrypt and decrypt the disk encryption keys using the Key Encryption Key (KEK). Without these specific cryptographic permissions, the encryption operation fails, even if soft-delete and a KEK are correctly configured.
What should I do if I get this AZ-500 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.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-500 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 AZ-500 exam.
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