Microsoft 365 users can reserve a meeting room even though it's already reserved for another meeting

Original KB number:   3066068

Symptoms

When a Microsoft 365 user tries to schedule a meeting in a room that's already reserved for another meeting, the Calendar Attendant doesn't automatically decline the conflicting meeting request.

Cause

This issue occurs if the AllRequestOutOfPolicy property of the room mailbox is set to True. This causes the room mailbox to ignore conflicting meeting requests.

Resolution

To resolve this issue, set the AllRequestOutOfPolicy property of the room mailbox to False. To do this, follow these steps:

1. Connect to Exchange Online by using remote PowerShell. For more information, see Connect to Exchange Online PowerShell.

2. Run the following command:

   Get-CalendarProcessing -Identity "Meeting Room" | Set-CalendarProcessing -AllRequestOutOfPolicy $False
   

More information

For more information about the Calendar Attendant in Microsoft 365, see:

• Configure the Automated Booking policies for a resource mailbox
• Enable or disable Automatic Booking on a resource mailbox

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