Double bookings allowed on a resource room how do I disabled this?

Since Exchange Online has deprecated the Remote PowerShell module, how does one now run these PowerShell commands in EAC that you've mentioned here in order to check and set the AllowConflicts settings?

I am having the same issue within my organization. Disabling "allow repeated meetings" does not fix the issue of people being able to book conflicting meetings in the same room. In fact we do want people to be able to book the room for recurring meetings they may have. However we do not want people to be able to double-book the same room. If it is already booked, it should auto-decline. I do not see that option in the settings. Please advise.

We are running classic outlook build 2406. I ran this command after going back into the EAC disabling that as you requested, It still allowed a same time conflicting meeting in the room. Thank you.

Hello Anonymous user_415,

Many thanks for the response.

You're welcome! Since even after disabling the setting in the Exchange Admin Center (EAC), the room is still allowing conflicting meetings. This can take effect after some time, if the issue still persists after 24 hours; Here are some addition steps to follow:

1. Ensure that the AllowConflicts parameter is set to $False for the room mailbox. You can check this by running: Get-CalendarProcessing -Identity "RoomMailbox" | Format-List AllowConflicts If it’s not set to**$False**, you can set it using: Set-CalendarProcessing -Identity "RoomMailbox" -AllowConflicts $False
2. Sometimes, delegate settings can override the default room settings. Ensure that no delegates have permissions that might allow conflicting bookings.
3. If the issue persists, try clearing the offline items for the calendar. This can help sync clean copies of the meeting items from the server. Refer to Outlook shows conflict errors when updating or cancelling meetings - Microsoft Support

If these steps don’t resolve the issue, it might be helpful to provide more details or screenshots of your current settings. This can help in diagnosing the problem more accurately.

Feel free to reach out if you need further assistance!

Dear Anonymous user_415;

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

Based on your description, I understand that you have a concern with "No scheduling conflict after booking the same meeting room for same time slot on Outlook Calendar". Before we proceed the investigation, we need more detailed information about the situation you are experiencing.

Please help us in isolating the issue by providing the following information:

1. What version of Outlook are you using? See What version of Outlook do I have? (microsoft.com)
2. Have you run the command shared in that article? If so, run the following command and check if it works >>> Get-CalendarProcessing -Identity "Meeting Room" | Set-CalendarProcessing -AllowConflicts $False
3. The "Allow repeated meetings" option must be disabled as in Manage resource mailboxes in Exchange Online | Microsoft Learn.

Please go to Exchange admin center (microsoft.com), Go to Resources > Select the room mailbox > Select Booking > then disable the "Allow Repeated meetings" option as in the screenshot below.

We look forward to hearing from you, please let me know and provide a more detailed description so we can provide you with more specific assistance. Thank you for your cooperation.