Exam AB-410 Topic 1 Question 16 Discussion

Actual exam question for Microsoft's AB-410 exam
Question #: 16
Topic #: 1
Hotspot Question
A company runs Power Automate cloud flows in production.
You observe many duplicate executions and 401 error codes when you review the flow runs.
You need to resolve the errors.
How should you address each error? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

Suggested Answer:


Explanation:
Box 1: Reauthenticate connection
A 401 (Unauthorized) error in production typically means a connection's authentication token is expired, the account lacks permissions, or a password change invalidated the OAuth token. To restore the flow, fix the underlying connection.
How to Fix Authentication Failures
1. Check Run History: In the Power Automate Run History, open the failed flow run to identify exactly which action is returning the 401 error.
*-> 2. Re-authenticate the Connection
Box 2: Enable concurrency control
To fix duplicate executions in production Power Automate cloud flows, you should Enable concurrency control and set the limit to 1.
The Root Cause: Duplicate executions usually happen when an upstream system sends multiple rapid requests, or a trigger fires twice before the first run finishes.
The Solution: Enabling concurrency control with a limit of 1 forces the flow to process only one run at a time. Subsequent triggers are queued up orderly, preventing overlapping actions and race conditions.
Reference:
https://learn.microsoft.com/en-us/troubleshoot/power-platform/power-automate/flow-run-issues/triggers-troubleshoot

by Tiffany at Aug 21, 2026, 10:45 PM

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