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PL-900 Practice Question: A Power Pages site allows external vendors to…
A Power Pages site allows external vendors to register and submit invoices. The site uses Microsoft Entra ID for authentication. Recently, some vendors reported they cannot log in and receive an error about insufficient permissions. What is the most likely cause?
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 vendors have not been invited as guest users in the Microsoft Entra ID tenant.
When using Microsoft Entra ID, the vendor must be invited as a guest user in the tenant, and if not, they will get an access error. Option A is wrong because the issue is about authentication, not licensing. Option C is wrong because cookies are not the primary issue. Option D is wrong because the identity provider is configured.
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 identity provider for the site is not configured.
Why it's wrong here
If not configured, all users would fail, not just some.
- ✓
The vendors have not been invited as guest users in the Microsoft Entra ID tenant.
Why this is correct
Guest users must be added to the tenant to authenticate.
- ✗
The site's cookie settings block third-party authentication.
Why it's wrong here
Unlikely to cause insufficient permissions error.
- ✗
The vendors do not have a Power Pages license.
Why it's wrong here
External users access Power Pages sites without individual licenses.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PL-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PL-900 exam.