The OAuth 2.0 On-Behalf-Of flow is the correct choice because it enables a web app to securely obtain an access token for a downstream API while preserving the original user’s identity and permissions. This flow works by using the initial user-authenticated token from Microsoft Entra ID as a credential to request a new token for the downstream API, effectively chaining authentication from the web app to the next service. On the AZ-204 exam, this scenario tests your understanding of token exchange in multi-tier applications, often appearing as a trap where candidates mistakenly choose the Authorization Code flow, which only handles user login, not downstream calls. A common memory tip is to think “user passes the baton”—the web app acts as a middleman, using the user’s context to call the next API, unlike the Client Credentials flow which ignores the user entirely. Remember: On-Behalf-Of is for chaining, Authorization Code is for logging in.
AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 developer is configuring a web app to authenticate users with Microsoft Entra ID. The web app needs to call a downstream API that also uses Microsoft Entra ID for authentication. The developer must ensure that the web app can securely obtain access tokens for the downstream API. Which authentication flow should the developer implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
OAuth 2.0 On-Behalf-Of flow
Option B is correct because the OAuth 2.0 On-Behalf-Of flow allows a web app to use the user's identity to obtain a token for a downstream API. Option A is incorrect because the Authorization Code flow is for user authentication, not for chaining to a downstream API. Option C is incorrect because Client Credentials flow is for daemon apps, not for user context. Option D is incorrect because the Implicit flow is deprecated and not secure.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
OAuth 2.0 Client Credentials flow
Why it's wrong here
Client Credentials flow is for non-interactive scenarios without a user context.
✗
OAuth 2.0 Implicit flow
Why it's wrong here
Implicit flow is deprecated and not recommended for new applications.
✓
OAuth 2.0 On-Behalf-Of flow
Why this is correct
On-Behalf-Of flow allows the web app to use the user's identity to get a token for the downstream API.
Related concept
Authentication checks who the user is.
✗
OAuth 2.0 Authorization Code flow
Why it's wrong here
Authorization Code flow is for user authentication, not for obtaining tokens for a downstream API.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Trap categories for this question
Scenario analysis trap
Client Credentials flow is for non-interactive scenarios without a user context.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related AZ-204 questions on access control and AAA configuration.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: OAuth 2.0 On-Behalf-Of flow — Option B is correct because the OAuth 2.0 On-Behalf-Of flow allows a web app to use the user's identity to obtain a token for a downstream API. Option A is incorrect because the Authorization Code flow is for user authentication, not for chaining to a downstream API. Option C is incorrect because Client Credentials flow is for daemon apps, not for user context. Option D is incorrect because the Implicit flow is deprecated and not secure.
What should I do if I get this AZ-204 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related AZ-204 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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