This AZ-400 practice question tests your understanding of design and implement build and release pipelines. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your release pipeline includes a 'Deploy to App Service' task for a Linux web app. The deployment fails with 'Error: Failed to deploy web package to App Service'. What should you check first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Verify that the deployment slot is correctly configured.
Why wrong: Slots are not required for basic deployment.
Check the Kudu console for errors.
Why wrong: Kudu is only available for Windows App Service.
Ensure the web.config file is present.
Why wrong: Linux web apps do not use web.config.
Review the App Service diagnostic logs.
Diagnostic logs contain detailed deployment errors.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Review the App Service diagnostic logs.
Option B is correct because App Service logs provide detailed error messages. Option A is wrong because Kudu is for Windows apps, not Linux. Option C is wrong because deployment slots are optional. Option D is wrong because the web.config is for IIS, not Linux.
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.
Verify that the deployment slot is correctly configured.
Why it's wrong here
Slots are not required for basic deployment.
Check the Kudu console for errors.
Why it's wrong here
Kudu is only available for Windows App Service.
Ensure the web.config file is present.
Why it's wrong here
Linux web apps do not use web.config.
Review the App Service diagnostic logs.
Why this is correct
Diagnostic logs contain detailed deployment errors.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Identify which AZ-400 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.
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FAQ
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..
The correct answer is: Review the App Service diagnostic logs. — Option B is correct because App Service logs provide detailed error messages. Option A is wrong because Kudu is for Windows apps, not Linux. Option C is wrong because deployment slots are optional. Option D is wrong because the web.config is for IIS, not Linux.
Identify which AZ-400 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.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This AZ-400 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-400 exam.
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