Quick Answer
The answer is an App Registration in Microsoft Entra ID and the Client ID with Client Secret. These two components are mandatory because the App Registration establishes a unique identity for your web app within the Microsoft identity platform, while the Client ID and Client Secret serve as the credentials required to initiate the OAuth 2.0 authorization code flow and obtain tokens for authenticated users. On the AZ-204 exam, this concept tests your understanding of the OpenID Connect authentication flow in Azure App Service, often appearing in scenario-based questions where you must distinguish between required components and optional settings like reply URLs or token stores. A common trap is confusing the App Registration itself with the authentication settings inside the App Service portal—remember that the registration must exist first in Entra ID. Memory tip: think of the App Registration as the “who” and the Client Secret as the “proof” of identity.
This AZ-204 practice question tests your understanding of develop azure compute solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 an Azure App Service web app that must authenticate users via Microsoft Entra ID. Which TWO components are required to set up authentication?
A managed identity
Why wrong: Managed identities are for Azure resources to authenticate to other services.
Client ID and Client Secret
These are used in the OAuth2 flow to obtain tokens.
An App Registration in Microsoft Entra ID
App Registration provides the identity for the app.
An Azure AD B2C tenant
Why wrong: B2C is for customer-facing apps, not internal users.
Azure Front Door
Why wrong: Front Door is for global load balancing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Client ID and Client Secret
To authenticate users via Microsoft Entra ID in an Azure App Service web app, you must register the app in Entra ID (Option C) to establish an identity and configure authentication. The Client ID and Client Secret (Option B) are then used as credentials in the OAuth 2.0 authorization code flow to verify the app's identity and obtain tokens. These two components are mandatory for the standard OpenID Connect authentication flow.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
A managed identity
Why it's wrong here
Managed identities are for Azure resources to authenticate to other services.
Client ID and Client Secret
Why this is correct
These are used in the OAuth2 flow to obtain tokens.
Related concept
Read the scenario before looking for a memorised answer.
An App Registration in Microsoft Entra ID
Why this is correct
App Registration provides the identity for the app.
Related concept
Read the scenario before looking for a memorised answer.
An Azure AD B2C tenant
Why it's wrong here
B2C is for customer-facing apps, not internal users.
Azure Front Door
Why it's wrong here
Front Door is for global load balancing.
Common exam traps
The trap here is that candidates often confuse managed identities (used for Azure resource-to-resource authentication) with the credentials needed for user authentication, leading them to select Option A instead of the correct Client ID and Secret.
Detailed technical explanation
Under the hood, the Client ID identifies the application to the Entra ID authorization server, while the Client Secret (or certificate) acts as a shared secret for the OAuth 2.0 client credentials grant or authorization code flow. The App Registration creates a service principal and defines redirect URIs, scopes, and permissions. In a real-world scenario, using a Client Secret in production is less secure than a certificate; Azure App Service supports certificate-based authentication via the `client_assertion` parameter in the token endpoint.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Client ID and Client Secret — To authenticate users via Microsoft Entra ID in an Azure App Service web app, you must register the app in Entra ID (Option C) to establish an identity and configure authentication. The Client ID and Client Secret (Option B) are then used as credentials in the OAuth 2.0 authorization code flow to verify the app's identity and obtain tokens. These two components are mandatory for the standard OpenID Connect authentication flow.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This AZ-204 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-204 exam.
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