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A company stores sensitive documents in an Azure Blob Storage account. They have enabled infrastructure encryption and configured the storage account to use a customer-managed key stored in Azure Key Vault for encryption at rest. Despite this, newly uploaded blobs are still encrypted with Microsoft-managed keys. What is the most likely cause?

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A company stores sensitive documents in an Azure Blob Storage account. They have enabled infrastructure encryption and configured the storage account to use a customer-managed key stored in Azure Key Vault for encryption at rest. Despite this, newly uploaded blobs are still encrypted with Microsoft-managed keys. What is the most likely cause?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Distractor review

The Key Vault is in a different Azure region than the storage account.

The Key Vault can be in any region as long as the storage account can access it. Cross-region Key Vaults are supported, so this is not the issue.

B

Distractor review

The storage account does not have a system-assigned managed identity enabled.

For customer-managed keys, the storage account uses a managed identity to access the Key Vault. If the managed identity is missing or not configured, encryption operations would fail, but they would not fall back to Microsoft-managed keys silently. The blobs would not upload successfully or would fail encryption.

C

Best answer

A default encryption scope is configured on the blob container that uses a Microsoft-managed key.

Encryption scopes can be set at the container level. A default encryption scope overrides the storage account-level encryption. If the scope uses Microsoft-managed keys, new blobs in that container will not use the customer-managed key.

D

Distractor review

The customer-managed key in Key Vault is disabled or expired.

If the key is disabled or expired, encryption operations would fail (blobs would not be written), not silently fall back to Microsoft-managed keys.

Common exam trap

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Technical deep dive

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • 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.

Related practice questions

Related AZ-500 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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AZ-500 scenario practice questions

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AZ-500 troubleshooting practice questions

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

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Question 6

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FAQ

Questions learners often ask

What does this AZ-500 question test?

Read the scenario before looking for a memorised answer.

What is the correct answer to this question?

The correct answer is: A default encryption scope is configured on the blob container that uses a Microsoft-managed key. — Azure Blob Storage supports encryption scopes, which allow you to apply different encryption policies at the container or blob level. If a default encryption scope is set on a container, it overrides the storage account-level encryption settings. The storage account-level customer-managed key only applies when no encryption scope is specified. Therefore, if the container has a default encryption scope that uses Microsoft-managed keys, new blobs will be encrypted with those keys regardless of the storage account setting.

What should I do if I get this AZ-500 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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