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How to View Meeting Room Calendar Details in Microsoft 365
Question details
Administrators need to configure permissions to allow users to view detailed meeting room calendar information instead of just the default busy status, and resolve access-denied errors that occur after granting Full Access.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Configuring meeting room mailbox delegation in the Exchange Admin Center to expose calendar event details to specific users.
- Observed behavior
- Users only see a 'Busy' status on the calendar or encounter an 'access-denied' error even after a Microsoft 365 administrator has granted them Full Access to the meeting room mailbox.
Ensure you are logged in with Microsoft 365 Administrator privileges, as configuring resource mailbox permissions requires access to the Exchange admin center.
Grant Reviewer Permissions in Exchange Admin Center
Assign specific Reviewer access to the meeting room calendar to allow users to see full event details, then wait for the changes to synchronize.
When users only see 'Busy' on a meeting room calendar, they lack the specific calendar-level permissions required to view full event details. Even if Full Access is granted, explicitly assigning Reviewer permission is often necessary.
Keep in mind that Microsoft 365 permission changes are not instant. It typically takes up to 60 minutes for the changes to propagate, but in some instances, it may take more than 24 hours.
Log into your Microsoft 365 admin dashboard and navigate to the Exchange admin center.
Go to 'Recipients' in the left-hand navigation menu and select 'Resources'.
Select the specific meeting room you want to configure and click the pencil icon to edit it. Open the 'Mailbox Delegation' tab.
Click the plus (+) icon to add a delegate. Search for the target user, select 'Reviewer' from the Permission dropdown menu, click 'Add', and then 'OK' to save the changes.
Reassign Permissions for Persistent Access Denied Errors
If the access denied error persists after a full 24 hours of waiting, removing and re-adding the user can force a fresh synchronization.
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Frequently Asked Questions
Why does the meeting room calendar only show 'Busy'?
By default, resource calendars in Microsoft 365 are configured to only display free/busy status to protect privacy. To view full meeting details like the organizer or subject, a user must be granted Reviewer permissions by an administrator.
How long does it take for Full Access permissions to work in Microsoft 365?
After an administrator grants Full Access or Reviewer permissions in the Exchange admin center, the changes typically take about 60 minutes to propagate. However, depending on server replication, it may occasionally take up to 24 hours for full synchronization.
Can regular users view meeting room details without administrator help?
No, an administrator must configure the initial Mailbox Delegation settings in the Exchange admin center to grant users the necessary permissions before they can view detailed calendar entries.
What should I do if I still get an 'access-denied' error after waiting 24 hours?
If the standard permission propagation delay has passed and access is still denied, the administrator should completely remove your permissions in the Exchange admin center, save the changes, and then re-add you as a delegate to force a fresh synchronization.
