Fix Resource Calendar Automatically Accepting Meetings After Adding a Delegate
Question details
Users need to prevent a resource calendar from automatically accepting meeting requests after assigning a delegate through Outlook on the web.
- Product
- Microsoft Outlook / Exchange Online
- Device & OS
- not provided
- Scenario
- Adding a delegate to manage a resource calendar using the Outlook on the web interface.
- Observed behavior
- The resource calendar begins automatically accepting meeting requests despite automatic processing appearing to be disabled in the Exchange settings.
Ensure you have Microsoft 365 administrator privileges and the necessary Exchange Online mailbox permissions to modify resource calendar settings.
Temporarily Remove the Delegate and Verify Settings
Removing the delegate isolates the issue, helping you determine whether the automatic processing is triggered by specific user permissions or an underlying server-side conflict.
Adding a delegate via Outlook on the web can sometimes inadvertently override disabled auto-processing settings in Exchange. Temporarily removing the delegate allows you to verify the baseline configuration of the resource mailbox.
Log into Outlook on the web, access the resource calendar settings under 'Sharing and permissions', and temporarily remove the recently added delegate to see if the auto-accept behavior stops.
Review the calendar's sharing settings to ensure no other users possess unintended author or editor rights that might be automatically processing meeting requests.
Access the Exchange Admin Center to verify the resource mailbox's automatic processing settings. Additionally, open the resource mailbox directly to check for any hidden Inbox rules that might be accepting invitations.
Open a Microsoft 365 Support Request
If removing the delegate does not resolve the issue or the behavior cannot be explained by your current settings, the problem requires Exchange Online backend investigation.
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Frequently Asked Questions
Why does my Exchange resource calendar auto-accept meetings?
By default, resource calendars (like room or equipment mailboxes) are often configured to automatically accept or decline meeting requests based on availability. However, if auto-processing is intentionally disabled, adding a delegate via Outlook on the web can sometimes cause a known glitch where meetings are auto-accepted anyway.
How do I check the automatic processing settings for a resource mailbox?
You can check this in the Exchange Admin Center. Navigate to Recipients > Resources, select the specific resource mailbox, and review the 'Booking delegates' and 'Booking options' to ensure it is set to your preferred approval method.
Will removing the delegate permanently delete their permissions?
No, removing the delegate temporarily revokes their ability to manage the calendar. You can easily re-add them later through Outlook on the web or the Exchange Admin Center once the underlying processing issue is resolved by Microsoft support.
