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Fix Exchange Online Room Acceptance Message Delays
Question details
Room acceptance messages are taking 10 to 15 minutes to arrive after an Exchange Online migration, temporarily removing meetings from the room calendar.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Managing room mailboxes and tracking meeting request responses following a migration to Exchange Online.
- Observed behavior
- Meeting acceptance messages are delayed by up to 15 minutes, and scheduled meetings do not appear on the room calendar during this delay.
Ensure you have Exchange Administrator permissions and have installed the Exchange Online PowerShell module to execute calendar processing commands.
Verify AutoAccept Configuration via PowerShell
Check and enforce the automatic processing of meeting requests for the affected room mailboxes to eliminate manual or delayed processing.
By default, room mailboxes should automatically accept or decline meetings based on availability. If this setting was altered during migration, the server may delay the calendar processing.
Open PowerShell as an administrator and run 'Connect-ExchangeOnline' to authenticate with your administrator credentials.
Run the command: Get-CalendarProcessing -Identity <room_mailbox_address> | Select AutomateProcessing. Replace <room_mailbox_address> with the actual email address of the room.
If the output is not set to 'AutoAccept', update it by running: Set-CalendarProcessing -Identity <room_mailbox_address> -AutomateProcessing AutoAccept.
Run a Message Trace in Exchange Admin Center
Trace the email flow to identify exactly where the processing or delivery delays are occurring between submission and delivery.
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Frequently Asked Questions
Why do room mailboxes take so long to update after an Exchange migration?
Migrations can temporarily disrupt background synchronization and routing rules. If the issue persists, the mailbox's calendar processing setting might not be properly configured to AutoAccept, forcing the server into a holding pattern.
What is the AutoAccept setting in Exchange Online?
AutoAccept is a calendar processing configuration that allows a resource or room mailbox to automatically accept or decline meeting requests based on its availability, ensuring calendars stay updated without manual intervention.
How can I tell if the delay is a mail-flow issue or a calendar issue?
You can use the Message Trace feature in the Exchange Admin Center. If the message trace shows immediate delivery to the room mailbox but the calendar doesn't update, it is a calendar processing issue. If the trace shows a delay between the Submit and Deliver stages, it is a mail-flow issue.
