Quick Answer
The correct answer is that the generated schema does not account for all possible fields. This happens because Power Automate’s Parse JSON action creates a schema based strictly on the sample payload you provide; when the webhook later sends data containing optional fields that were absent from that sample, the schema lacks definitions for those fields, causing the action to reject the entire payload as “Invalid JSON.” On the PL-900 exam, this scenario tests your understanding of how schema generation works with dynamic data—a common trap is assuming the error means the webhook is broken or that the JSON syntax itself is malformed, when in fact the schema is simply incomplete. Remember the memory tip: “If the schema doesn’t list it, Parse JSON will resist it.” Always include a representative sample that covers all optional fields, or use a schema that allows additional properties, to avoid this failure.
This PL-900 practice question tests your understanding of demonstrate the capabilities of power automate. 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.
A Power Automate flow uses the 'Parse JSON' action to process incoming webhook data. The flow fails with the error 'Invalid JSON' when the webhook sends data. You review the sample payload used to generate the schema and notice the webhook sometimes includes additional optional fields. 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.
The generated schema does not account for all possible fields.
Extra fields cause schema mismatch.
The flow is trying to parse the JSON before receiving it.
Why wrong: The action runs after receiving.
The webhook is not sending a valid JSON payload.
Why wrong: The error is from the parse action, not the webhook.
The JSON contains a nested object that is not defined.
Why wrong: Nested objects would still be valid if schema includes them.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The generated schema does not account for all possible fields.
Option B is correct because the 'Parse JSON' action uses a schema generated from a sample payload. If the schema does not include optional fields, the action will fail when those fields are present. Option A is wrong because the webhook is sending data. Option C is wrong because the flow action is to parse, not to create. Option D is wrong because the error is 'Invalid JSON' not a missing property.
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.
The generated schema does not account for all possible fields.
Why this is correct
Extra fields cause schema mismatch.
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 is trying to parse the JSON before receiving it.
Why it's wrong here
The action runs after receiving.
The webhook is not sending a valid JSON payload.
Why it's wrong here
The error is from the parse action, not the webhook.
The JSON contains a nested object that is not defined.
Why it's wrong here
Nested objects would still be valid if schema includes them.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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.
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FAQ
Demonstrate the capabilities of Power Automate — This question tests Demonstrate the capabilities of Power Automate — Read the scenario before looking for a memorised answer..
The correct answer is: The generated schema does not account for all possible fields. — Option B is correct because the 'Parse JSON' action uses a schema generated from a sample payload. If the schema does not include optional fields, the action will fail when those fields are present. Option A is wrong because the webhook is sending data. Option C is wrong because the flow action is to parse, not to create. Option D is wrong because the error is 'Invalid JSON' not a missing property.
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.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
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