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JoeGrover asked LucasLiu-MSFT commented

Migrated 365 user - Owner permissions not working on resource mailbox calendar

I'm in the process of migrating all of our mailboxes to 365. I've not had any issues with migrated users being able to access/modify resource calendars that had not been migrated (as long as the resource's AD account was synced to 365) until today.

Over the weekend I migrated the users of one of our regional offices. Today one of them said they couldn't edit the conference room calendars for that office. I figured that I needed to migrate them anyway, so I did.

It's been over an hour since their migration completed, but the user still can't edit the calendars. What's worse, neither can I.

I ran Get-MailboxFolderPermission against the conference room :\Calendar and see that I'm still set as the Owner, and the other users that need to be are still set as Publishing Editors. We cannot however make any changes. Double-clicking on a space in the calendar gives the following error:

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Right-clicking on the calendar and selecting Properties does in fact look like I have no permissions (I only have General and Summary tabs).

I used PowerShell to try to re-apply permissions but it said no changes were made (since the permissions are already there). What else should I look at? I can also confirm that it does not work via OWA, either.

EDIT I've also logged into the mailbox with Outlook and confirmed the permissions shows the same information as the Get-MailboxFolderPermissions output (but still won't allow those users to make changes).


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LucasLiu-MSFT answered LucasLiu-MSFT commented

Hi @JoeGrover ,
Only one specific room mailbox have this issue or all room mailbox have this issue?

I mentioned that you check the calendar in the Outlook client and look like you don’t have any permissions. It seems that the permissions are not applied to the room mailbox. Please try to assign the “Full Access” permission of room mailbox to a specific user mailbox. Then log in to the mailbox and right-click the calendar, then select “Properties…”. Manually add users and permissions afterwards. After saving, create a new Outlook profile for the user who is assigned permissions, and check whether the room mailbox can be edited.
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Only some room mailboxes are having this issue.

  • Looking at the permissions using either Get-MailboxFolderPermissions or logging into the room mailbox using Outlook both show I (and the other users) already have the proper permissions (Full Access or Owner, respectively for me).

  • The only way I see I don't in fact have the permissions is if I go to the calendar's properties logged into Outlook as myself, or if I try to actually do anything with the calendar.


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The affected users have indicated that it started working for them the next day. It still wasn't working for me this morning, so I removed and reapplied my Owner permission to the room calendars via Powershell and it's now working. Go figure.

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Hi @JoeGrover ,
Thanks for provide the information.
So after that, have you migrated user mailboxes? Can these users access the resource mailbox normally?



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