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 HTTP 429 with a Retry-After header, not 403, so intermittent failures point elsewhere. A 403 with application permissions typically means the service principal lacks SharePoint site-level authorisation or the permission grant was never consented; throttling would be the cause under high-volume 429 responses.
- ✗
The service principal has been disabled in Microsoft Entra ID.
Why it's wrong here
A disabled service principal fails authentication consistently with invalid_client or 401, and every flow using it breaks at once. It is tempting because it is an Entra ID identity issue, but it is correct when credentials are revoked outright, not when a single flow fails intermittently.
- ✗
SharePoint Online is experiencing a service outage.
Why it's wrong here
A tenant-wide SharePoint outage would break every flow and user, not one flow intermittently. It is tempting because 403 errors can accompany service incidents, but outage scenarios present as broad, sustained failures, whereas intermittent single-flow 403s point to throttling.
- ✓
The service principal lacks the necessary SharePoint API permissions or admin consent.
Why this is correct
Service principals authenticate as applications, so they need SharePoint application permissions such as Sites.FullControl.All granted with tenant admin consent. Missing permissions or absent consent produce intermittent 403 Forbidden responses when the flow calls the SharePoint API.
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