PL-900 Demonstrate the capabilities of Power Apps Practice Question
A developer builds a canvas app that uses a custom connector to call an external API. The API requires an OAuth 2.0 client credentials flow. Which authentication type should the developer configure in the custom connector?
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
✓
OAuth 2.0
OAuth 2.0 client credentials flow is a standard OAuth flow used for server-to-server authentication where no user is involved. Option B is incorrect because Windows Authentication is not OAuth-based and does not support client credentials flow. Option C is incorrect because API Key is a simple token-based authentication, not OAuth. Option D is incorrect because Basic Authentication sends credentials in plaintext and is not OAuth 2.0.
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
Why this is correct
OAuth 2.0 is the only custom connector authentication type supporting the client credentials grant, where the app authenticates as itself using a client ID and secret rather than a signed-in user. This satisfies the API's machine-to-machine requirement.
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Windows Authentication
Why it's wrong here
Windows Authentication negotiates Kerberos or NTLM against an on-premises directory, which cannot perform the token exchange the API's OAuth 2.0 client credentials flow demands. It is tempting for internal APIs secured by domain credentials, but here the connector must send client ID and secret to obtain an access token.
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API Key
Why it's wrong here
An API Key sends a static shared secret in a header or query string, providing no token issuance or client credential exchange. It is tempting because API keys are common for simple service authentication, but the API explicitly mandates an OAuth 2.0 client credentials flow.
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Basic Authentication
Why it's wrong here
Basic Authentication transmits a static username and password per request and issues no bearer token, so it cannot satisfy the OAuth 2.0 client credentials flow. It is tempting for simple APIs with fixed credentials, but this API requires the connector to exchange client credentials for an access token.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PL-900 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 PL-900 exam.