The answer is a missing 'Respond to a PowerApp or flow' action, because when a Power Automate HTTP request trigger receives a call from an external application, the flow must explicitly send a response back to that caller; without this action, the trigger times out and defaults to a 500 Internal Server Error, even if the flow itself runs successfully. This tests your understanding of synchronous request-response patterns in Power Automate, a common pitfall on the PL-900 exam where many candidates assume a successful flow run guarantees a successful HTTP response. The key trap is confusing a 500 error with an authentication failure (which returns 401) or a trigger failure—here, the trigger fires and the flow runs, but the missing response action leaves the external application waiting indefinitely until the platform returns the generic 500. Remember: if the flow runs but the caller gets a 500, check for the response action—no response means a 500 response.
PL-900 Practice Question: Demonstrate the capabilities of Power Automate
This PL-900 practice question tests your understanding of demonstrate the capabilities of power automate. 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.
A Power Automate flow uses a 'When a HTTP request is received' trigger. The flow is called by an external application. The flow runs successfully but the external application receives a '500 Internal Server Error' response. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The flow does not have a 'Respond to a PowerApp or flow' action to send a response.
Option D is correct because the HTTP trigger returns a 500 error when the flow response action is not configured correctly, such as missing a 'Respond to a PowerApp or flow' action. Option A is wrong because the trigger fires. Option B is wrong because the flow runs, so the request is received. Option C is wrong because authentication errors typically return 401.
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.
✗
The flow is disabled or paused.
Why it's wrong here
A disabled flow would not run.
✗
The external application is not sending the correct JSON payload.
Why it's wrong here
Incorrect payload would cause a different error.
✓
The flow does not have a 'Respond to a PowerApp or flow' action to send a response.
Why this is correct
Without a response action, the HTTP trigger times out or returns 500.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The flow requires authentication and the API key is missing.
Why it's wrong here
Authentication errors return 401.
Common exam traps
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.
Detailed technical explanation
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.
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.
What to study next
Got this wrong? Here's your next step.
Identify which PL-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Demonstrate the capabilities of Power Automate — This question tests Demonstrate the capabilities of Power Automate — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The flow does not have a 'Respond to a PowerApp or flow' action to send a response. — Option D is correct because the HTTP trigger returns a 500 error when the flow response action is not configured correctly, such as missing a 'Respond to a PowerApp or flow' action. Option A is wrong because the trigger fires. Option B is wrong because the flow runs, so the request is received. Option C is wrong because authentication errors typically return 401.
What should I do if I get this PL-900 question wrong?
Identify which PL-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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