PL-900 Practice Question: Manage the Microsoft Power Platform environment
A financial services company uses Power Automate to process loan applications. The flow uses the ‘When a new email arrives’ trigger from a shared mailbox. The flow recently stopped working after an admin changed the mailbox permissions. What is the most likely cause?
⚠ Common exam trap
Watch out — candidates often confuse a permissions issue with a storage limit or license problem, but the trigger's dependency on a valid connection object makes permission changes the immediate and 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 mailbox connection lost permissions to access the mailbox
The flow uses the 'When a new email arrives' trigger, which relies on a connection to the shared mailbox. When an admin changes mailbox permissions, the existing connection loses its authorization to access the mailbox, causing the trigger to fail. This is the most direct cause because the connection object in Power Automate must have valid permissions to read emails from the specified mailbox.
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 mailbox exceeded its storage limit
Why it's wrong here
Exceeding storage would cause different errors, not necessarily stop the trigger.
- ✓
The mailbox connection lost permissions to access the mailbox
Why this is correct
Permission changes can invalidate the existing connection, causing the trigger to fail.
- ✗
The flow owner's Power Automate license was deleted
Why it's wrong here
License deletion would affect all flows, not just mailbox-based ones.
- ✗
The flow was transferred to another owner
Why it's wrong here
Transfer of ownership does not automatically break mailbox connections.
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JA
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.