PL-900 Practice Question: Demonstrate the capabilities of Power Automate
You are a Power Platform administrator at Contoso Ltd. The company uses a Power Automate flow that monitors a SharePoint list for new items. When a new item is added, the flow retrieves data from an external CRM system via an HTTP request, then updates a second SharePoint list. Recently, the flow has been failing with a '400 Bad Request' error from the HTTP action. The CRM API endpoint and authentication are correct. The flow works for some items but fails for others. You need to identify the root cause and fix the flow. What should you do?
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
✓
Add a 'Compose' action to sanitize the input data before the HTTP request
The 400 Bad Request error typically indicates malformed request syntax, such as invalid characters in the payload. Adding a 'Compose' action to sanitize the input data (e.g., encode special characters, remove illegal XML characters) before the HTTP request can resolve the issue. Option A is wrong because the endpoint is confirmed correct, so changing it is unnecessary and would break integration. Option C is wrong because checking for existing items addresses duplication, not malformed requests. Option D is wrong because increasing retry count only re-attempts the same failing request; it does not fix the underlying data quality issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the HTTP action to use a different API endpoint
Why it's wrong here
Incorrect: The endpoint is correct per the stem.
- ✓
Add a 'Compose' action to sanitize the input data before the HTTP request
Why this is correct
Correct: Sanitizing can fix malformed requests causing 400 errors.
- ✗
Add a 'Condition' to check if the item already exists
Why it's wrong here
Incorrect: The error is 400, not a conflict.
- ✗
Increase the retry count for the HTTP action
Why it's wrong here
Incorrect: Retrying a bad request will still fail.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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