PL-900 Practice Question: Describe the business value of Microsoft Power Platform
You are a Power Platform administrator. A user reports that a Power Automate flow that connects to SharePoint Online fails intermittently with a '403 Forbidden' error. The flow uses a service principal with application permissions. What is the most likely cause?
⚠ Common exam trap
Test-takers frequently confuse 403 Forbidden (authorization failure) with 401 Unauthorized (authentication failure) or throttling errors, leading them to incorrectly select throttling or service outage options.
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
✓
The service principal lacks the necessary SharePoint API permissions or admin consent.
A 403 Forbidden error specifically indicates that the server understood the request but refuses to authorize it. Since the flow uses a service principal with application permissions, the most likely cause is that the service principal lacks the necessary SharePoint API permissions or that admin consent has not been granted for those permissions. Without proper permissions or consent, SharePoint Online rejects the request regardless of authentication validity.
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 exceeding the SharePoint Online API throttling limits.
Why it's wrong here
Throttling returns 429, not 403.
- ✗
The service principal has been disabled in Microsoft Entra ID.
Why it's wrong here
If disabled, the flow would fail consistently, not intermittently.
- ✗
SharePoint Online is experiencing a service outage.
Why it's wrong here
Outages are rare and would affect all users, not just this flow.
- ✓
The service principal lacks the necessary SharePoint API permissions or admin consent.
Why this is correct
Missing permissions cause 403; intermittency could be due to token expiration or conditional access.
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