The answer is authorization code flow with PKCE. This OAuth 2.0 grant type is the correct choice because it allows a public client web app to request delegated access to user resources—such as reading the user’s profile and sending emails—through a single consent prompt, minimizing repeated user interruptions. PKCE adds a cryptographic code verifier and challenge to the authorization code exchange, preventing interception attacks without needing a client secret, which is ideal for apps that cannot securely store secrets. On the AZ-204 exam, this scenario tests your understanding of secure authentication patterns in Microsoft Entra ID, often appearing as a trap where candidates mistakenly choose implicit grant or client credentials. Remember: if the app is a public client (no secret) and needs to minimize consent prompts while accessing user resources, always reach for PKCE—think “PKCE for peace of mind.”
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
You are developing a web app that authenticates users via Microsoft Entra ID. The app needs to read the user's profile and send emails on their behalf. You want to minimize user consent prompts. Which OAuth 2.0 grant type should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Authorization code flow with PKCE
The authorization code flow with PKCE (Proof Key for Code Exchange) is the recommended OAuth 2.0 grant type for public clients (like a web app) that need delegated user authentication and consent. It allows the app to obtain an access token to read the user's profile and a refresh token to send emails on their behalf, while minimizing consent prompts by using a single consent request for both permissions. PKCE adds a cryptographic challenge to prevent authorization code interception attacks, making it secure for web apps without a client secret.
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.
✓
Authorization code flow with PKCE
Why this is correct
Correct. This flow is secure, supports delegated permissions, and with PKCE it reduces consent prompts through silent token refresh.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Client credentials flow
Why it's wrong here
Incorrect. This flow uses app-only identity and does not involve user interaction, so it cannot act on behalf of a user.
✗
Resource owner password credentials
Why it's wrong here
Incorrect. This flow requires the user to provide credentials directly to the app, which is not secure and should be avoided.
✗
Implicit flow
Why it's wrong here
Incorrect. Implicit flow is deprecated due to security concerns and does not support refresh tokens, leading to frequent consent prompts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose the client credentials flow (B) thinking it minimizes prompts because it doesn't involve user interaction, but they overlook that the app needs to act on behalf of a specific user, which requires delegated permissions and user consent, not application permissions.
Detailed technical explanation
How to think about this question
Under the hood, the authorization code flow with PKCE uses a code_challenge (SHA-256 hash of a random code_verifier) sent in the initial authorization request, and the client must present the original code_verifier when exchanging the code for tokens. This ensures that even if the authorization code is intercepted, it cannot be redeemed without the verifier. In Microsoft Entra ID, the consent prompt can be minimized by using the 'prompt=consent' parameter only on the first request, and subsequent token refreshes happen silently via the refresh token without re-prompting the user.
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 AZ-204 question in full detail.
Implement Azure security — This question tests Implement Azure security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Authorization code flow with PKCE — The authorization code flow with PKCE (Proof Key for Code Exchange) is the recommended OAuth 2.0 grant type for public clients (like a web app) that need delegated user authentication and consent. It allows the app to obtain an access token to read the user's profile and a refresh token to send emails on their behalf, while minimizing consent prompts by using a single consent request for both permissions. PKCE adds a cryptographic challenge to prevent authorization code interception attacks, making it secure for web apps without a client secret.
What should I do if I get this AZ-204 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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Variation 1. You are developing a web app that authenticates users via Microsoft Entra ID. The app needs to call a downstream API on behalf of the signed-in user. Which OAuth 2.0 flow should you implement?
medium
A.Client credentials flow
B.Implicit flow
✓ C.Authorization code flow with PKCE
D.Device code flow
Why C: Option C is correct because the authorization code flow with PKCE is the recommended flow for single-page apps and native apps that need to call APIs on behalf of the user. Option A is wrong because the implicit flow is deprecated and less secure. Option B is wrong because client credentials is for non-user scenarios. Option D is wrong because device code flow is for devices without browsers.
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Question Discussion
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