Fix Office 365 Meeting Rooms Canceling All-Day Meetings
Question details
Users need to stop Office 365 meeting rooms from automatically canceling all-day meeting reservations at a specific time.
- Product
- Microsoft Office 365
- Device & OS
- not provided
- Scenario
- Booking an all-day meeting in an Office 365 meeting room via Outlook.
- Observed behavior
- The meeting room initially accepts the all-day meeting request but automatically declines or cancels it later at a specific time (e.g., 12:10 PM), while regular timed meetings work perfectly.
Verify whether this cancellation behavior happens when booking through both Outlook on the web and the Outlook desktop client to isolate the issue.
Verify Booking Platform and Review Calendar Processing Settings
Determine if the issue is client-specific and review backend meeting room processing settings with your administrator.
Meeting room mailboxes in Office 365 have specific calendar-processing settings that dictate how they handle meeting requests. If an all-day meeting exceeds the maximum allowed duration or conflicts with backend maintenance policies, the system may automatically decline it after initial acceptance.
Log in to Outlook on the Web and book an all-day meeting for the affected room to see if the cancellation still occurs.
Open the Outlook Desktop Client and book a similar all-day meeting to check if the desktop app is causing the sync or cancellation issue.
If the meeting is canceled on both platforms, ask your organization's Microsoft 365 administrator to review the room mailbox's calendar-processing settings in the Exchange Admin Center.
If the settings appear correct but the issue persists, have the administrator open an official support ticket with Microsoft Office Support.
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Frequently Asked Questions
Why do regular timed meetings work but all-day meetings get canceled in Office 365?
This is often due to the calendar-processing settings or booking window limits set on the room mailbox by the administrator, which might restrict meetings exceeding a certain duration (like 24 hours).
Can a standard user fix meeting room cancellation issues?
No, standard users cannot change room mailbox settings. You must contact your Microsoft 365 administrator to adjust the calendar-processing configurations in the Exchange Admin Center.
How do I know if the issue is with my Outlook desktop app?
You can isolate the issue by attempting to book the meeting room using Outlook on the web. If the room accepts the all-day meeting on the web but cancels it via the desktop app, the problem is likely related to your desktop client sync or cache.
