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Fix Power Automate Shared Mailbox Auto-Reply Fails
Question details
The user needs to resolve an issue where a Power Automate flow successfully processes attachments but fails to send an auto-reply from a shared mailbox.
- Product
- Power Automate
- Device & OS
- not provided
- Scenario
- Configuring an automated email reply workflow triggered by incoming emails to a shared mailbox.
- Observed behavior
- The Reply to email action fails, often returning an error referencing a May 6, 2020 policy change.
Verify that your account has 'Send As' or 'Send on Behalf' permissions for the shared mailbox, and locate the exact error message in your flow's run history.
Specify the Original Mailbox Address in Advanced Options
Resolve the common shared mailbox policy error by explicitly declaring the mailbox address in the reply action.
Due to an update deployed on May 6, 2020, Power Automate requires you to explicitly state the source mailbox when sending replies from shared mailboxes.
Open your Power Automate dashboard and open the failing flow in Edit mode.
Locate the 'Reply to email' action and click on it to expand the configuration settings.
Click on 'Show advanced options' at the bottom of the action card to reveal additional fields.
Find the 'Original Mailbox Address' field and input the exact email address of your shared mailbox.
Save your flow and trigger a test email to ensure the auto-reply now sends successfully.
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Frequently Asked Questions
Why do I get the 'As of May 6, 2020' error in Power Automate?
This error occurs because of a security policy update for shared mailboxes. To fix it, you must explicitly provide the shared mailbox address in the 'Original Mailbox Address' field under the advanced options of the 'Reply to email' action.
Do I need special permissions to send automated replies from a shared mailbox?
Yes, the account used to authenticate the Power Automate Outlook connection must have 'Send As' or 'Send on Behalf' permissions for the specified shared mailbox.
How can I view the exact error message my flow is generating?
Navigate to 'My flows' in Power Automate, click your flow, and select a failed run from the '28-day run history'. Expand the failed action to review the raw output and exact error details.
