Troubleshooting Office 365 Room Mailbox Permission Issue

Introduction

Recently, working with an enterprise customer, we came across an issue where Office 365 room mailbox permissions were not being applied correctly. Most of the time after we assign permission to a Room Mailbox in Office 365 the permissions were not synchronized correctly to outlook clients. We worked with Microsoft support for this issue but it seems to be a product “bug” but i cannot confirm this or it seems like PowerShell is the way to trust when working with workloads in Office 365. Troubleshooting Office 365 room mailbox permissions issue requires me to perform all level of testing and troubleshooting to ensure everything is in place but it wasn’t working properly. During the troubleshooting, we reassigned the permissions to a user on room mailbox via exchange online powershell and appropriately that seems to be working without any issue. 

Troubleshooting Office 365 Room Mailbox Permission Issue

Working with Office 365, when you assign a user permission to room mailbox so that the user can add the mailbox to outlook client and can create appointments, During the process of adding a room mailbox to outlook client, we were prompted with the following error message.

The workaround for this issue that worked for us in our scanerio was to remove the permissions and reassign the permissions using powershell. To assign the permissions using powershell, perform the following steps.

Troubleshooting Office 365 Room Mailbox Permission Issue

  • Retrieve the permissions being assigned to room mailbox using powershell

C:\> Get-MailboxFolderPermission -Identity confroom@msexperttalk.com:\Calendar

Troubleshooting Office 365 Room Mailbox Permission Issue

  • As you can see that i do not have the permissions to Calendar folder. Run the following cmdlet to assign permissions on calendar folder

C:\> Add-MailboxFolderPermission -Identity confroom@msexperttalk.com:\Calendar -User rjbutt@msexperttalk.com -AccessRights Owner

Troubleshooting Office 365 Room Mailbox Permission Issue

Re-run the Get-MailboxFolderPermission cmdlet to verify the permissions are being assigned to the user.

Troubleshooting Office 365 Room Mailbox Permission Issue

Once it’s done, restart outlook client  and the permissions will start synchronizing and the user will be able to create/edit/delete calendar appointments to the conference room mailbox. The issue that i had faced could be due to some back end issues with Exchange online and I do not recommend that this could be the issue with all deployments but i have seen much more success with PowerShell as compared to GUI and i always recommend to leverage Powershell over GUI.

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