The answer is to add a Compose action to sanitize the input data before the HTTP request. This is correct because a 400 Bad Request error indicates the server cannot process the request due to malformed syntax, often caused by special characters or invalid data pulled from the SharePoint list item. Since the CRM endpoint and authentication are verified, the issue lies in the payload itself; a Compose action can clean or encode the data, ensuring the HTTP request sends valid JSON or text. On the PL-900 exam, this tests your understanding of HTTP action troubleshooting and data transformation, a common scenario where candidates mistakenly adjust retry policies or blame throttling. The trap is assuming all 400 errors are server-side, when many stem from unsanitized inputs. Remember: if the flow works for some items but fails for others, the data is the culprit, not the connection.
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. 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.
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 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
Option B is correct because the HTTP action likely fails when the request payload contains special characters or invalid data from the SharePoint list item; adding a 'Compose' action to sanitize the input before the HTTP call can resolve the 400 error. Option A is wrong because retry policy might mask the issue but not fix malformed requests. Option C is wrong because the endpoint is correct per the stem. Option D is wrong because there's no indication of throttling.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PL-900 subnetting questions on CIDR, address ranges, and subnet selection.
Demonstrate the capabilities of Power Automate — This question tests Demonstrate the capabilities of Power Automate — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Add a 'Compose' action to sanitize the input data before the HTTP request — Option B is correct because the HTTP action likely fails when the request payload contains special characters or invalid data from the SharePoint list item; adding a 'Compose' action to sanitize the input before the HTTP call can resolve the 400 error. Option A is wrong because retry policy might mask the issue but not fix malformed requests. Option C is wrong because the endpoint is correct per the stem. Option D is wrong because there's no indication of throttling.
What should I do if I get this PL-900 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PL-900 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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