Calendar sharing issue

Gareth Davies 276

I have a user who has already shared her Outlook calendar with 3 people, however when she tries to share with a new person within the organization she gets the following

You don't have permission to share your calendar with user@keyman .com

She has tried in Outlook and outlook.office.com and both give the same error.
Our default sharing policy has not been changed and other users are able to share their own calendars. What could cause this?

Vasil Michev 95,666 Reputation points MVP

2021-01-06T20:45:05.247+00:00

Sharing policies do not affect intra-organizational sharing. Are you perhaps using GAL segmentation/information barriers within your organization?

I suppose you can try adding permissions directly via PowerShell, and include the -SharingPermissionFlags/-SendNotificationToUser to emulate the Outlook sharing experience.
Richard Jenner 6 Reputation points

2021-01-07T15:14:19.66+00:00

I have this exact same issue, although my user can't share her calendar with anyone at all not just new people. Maybe a broader Office 365 issue?
Gareth Davies 276 Reputation points

2021-01-12T17:33:14.597+00:00

So after trying what has been suggested, and a few other things I thought may help, this issue is still there. Using powershell results in the exact same failure, same message and result.
I created a new account to test if this was a wider issue, no problems with the new account. I can share this new calendar with anyone within the organization including the user who is unable to share her own calendar.

I also tried changing the permissions for people the problem calendar is shared with, this also fails with the message "The sharing invitation couldn't be updated. Please try again."

As previously stated, when trying to add share access to the calendar it fails with the message "You don't have permission to share your calendar with user@tiedtlaw email .com"

One thing I noticed is the user is listed as a reviewer of her own calendar but I don't see any way to modify this to make her owner of the calendar.

Does anyone have any new ideas?
Vasil Michev 95,666 Reputation points MVP

2021-01-19T07:00:15.69+00:00
Microsoft just released a new switch for the Remove-MailboxFolderPermission cmdlet, which might help here. Try running this:

Remove-MailboxFolderPermission user:\calendar ResetDelegateUserCollection
Gareth Davies 276 Reputation points

2021-01-19T16:20:51.38+00:00

Thanks, I would try that but the migration I started yesterday is still not finished. It keeps saying it has stalled due to source disk latency. Thanks for using slow disks Microsoft.
I doubt there is any way to cancel the migration so I'm now at the mercy of Microsoft and have to wait until it either times out or completes.
Doug Brewer 1 Reputation point

2021-01-29T22:48:01.577+00:00

Any one find a resolution on this?
I am working on a similar issue. Doesn't matter who my user tries to share with she gets an error.
She has tried to share her Calendar using the Outlook client as well as OWA she is getting "You don't have permission to share your calendar with user@keyman .com"

I granted myself access to her mailbox (Add-MailboxPermission -ID "user@keyman .com" -AccessRights Fullaccess -User "me@keyman .com")
I created the Outlook profile and can add users to her calendar without any issue via Outlook client however OWA still throws a permissions error.

I tried to add another user to her calendar using Powershell (Add-MailboxFolderPermission) but get 'Your request can't be completed. You don't have permission to share this calendar.' and I am a global admin. I was able to grant myself full access to her mailbox.
I have double checked her AD account as it syncs to O365 where the mailbox resides and everything matches up.
Eric Yin-MSFT 4,386 Reputation points

2021-02-01T08:48:07.187+00:00

Is the license assigned to the problematic user same as others?
Unassign the user's license and re-assgin for him,
or export his mailbox to pst file and delete his mailbox, then create a new mailbox and import the pst file.
See if it make a difference.
Gareth Davies 276 Reputation points

2021-02-01T14:33:20.183+00:00

The license is not the issue. This is not my first experience of Office 365 and different license types do not have an effect on the ability to share calendars.
Beside this, the use WAS able to share the calendar previously, no license changes were made so that is not the issue.

Exporting to a pst is also not an option, the mailbox is way too big to export to a single pst (16GB) and even if I decided to take the risk it would take far too long. The user can still send/receive email and uses her email constantly.

Update to those who mentioned migrating the mailbox. It is still possible to do this even though MS say the option was removed. However, it is VERY, VERY slow, as in it takes days to complete. It did NOT fix the issue
Eric Yin-MSFT 4,386 Reputation points

2021-02-02T07:38:30.14+00:00

As Doug Brewer posts, run get-mailboxfolderpermission and remove all permissions whose user no longer exsists, check and test if it works.
Gareth Davies 276 Reputation points

2021-02-02T14:07:02.503+00:00

if I run run get-mailboxfolderpermission it doesn't show any permissions, see below

So there are no orphaned permissions to remove
Doug Brewer 1 Reputation point

2021-02-02T14:39:07.56+00:00

Looks like you are not specifying the calendar - try the below
Get-MailboxFolderPermission -Identity john@Company portal .com:\Calendar
Gareth Davies 276 Reputation points

2021-02-02T14:58:06.557+00:00

Thank you, I had missed the \calendar. It listed 2 people who no longer have accounts. These have now been removed.

Still denies permission to add a new person to the calendar permissions though, same error
Doug Brewer 1 Reputation point

2021-02-02T15:00:28.723+00:00

Give it a couple of hours...When I removed a users access that no longer had an account it took awhile before it replicated.
I removed it on Sunday night and on Monday morning my user could grant users permissions.
Gareth Davies 276 Reputation points

2021-02-02T15:02:54.257+00:00

I had actually just said that to the user. I'll try it again later and post an update.

Thanks
Gareth Davies 276 Reputation points

2021-02-02T20:39:07.337+00:00

Interesting. Calendar permissions can now be set using Outlook, but Powershell and OWA still say I don't have permission to make changes.

At least now there is a means to set permissions, but it concerns me it only works from the Outlook client
Doug Brewer 1 Reputation point

2021-02-02T21:40:25.903+00:00

what command are you using?
It could be a timing issue. O365 is so slow to replicate changes. I tell users it can take up to 4hrs before they will see a shared mailbox in their Outlook client that I have granted them access to.
Gareth Davies 276 Reputation points

2021-02-02T21:52:16.503+00:00
I used Set-MailboxFolderPermission "target user:\calendar" -user "existing delegate" to try to modify permissions for an existing delegate and

Add-MailboxFolderPermission "target user:\calendar" -user "existing delegate"

to add permissions for a new delegate

Each then asks what level of access I want to provide but then give the error "Your request can't be completed. You don't have permission to share this calendar."

Trying to set it in OWA gives the exact same error
Doug Brewer 1 Reputation point

2021-02-02T21:54:13.843+00:00

those are the correct commands...I would give it more time as it is most likely a replication issue.
Richard Jenner 6 Reputation points

2021-02-08T19:52:42.433+00:00

I opened a case with MS about this probably 4 weeks ago, other than determining it is just the Default calendar' that is having the issue there has not been much in the way of a fix. It has been escalated ALOT so we will see.
I will update if it ever gets fixed.
Eric Yin-MSFT 4,386 Reputation points

2021-02-23T08:45:41.01+00:00

Hi, is that fixed now?
We have tried several solutions but the biggest progress is that @Gareth Davies can share the calendar on Outlook by clearing all folder permissions of the mailbox via powershell.
I just wonder if all of your issues occur with one specific mailbox?
You might need to contact O365 back end team to repair the mailbox, or creating the mailbox and importing his pst file to a new mailbox. Kind of a quick workround.
Gareth Davies 276 Reputation points

2021-02-23T20:11:56.15+00:00

No, the issue is NOT resolved.
It is a single mailbox, at least I only know of one with the issue.

Microsoft support told me to migrate the mailbox to a new database, despite saying this is no longer available. I had already done this and it took days. They offered nothing else.

I can't delete and recreate the mailbox for a number of reasons, but beside everything else the size of the box is over 15GB, I can't export this to a pst and I am not going to spend days exporting 2GB chunks, plus the calendar has a high volume of recurring meetings, these never import correctly so it would create more issues than it would resolve.
CJArchie 1 Reputation point

2021-03-16T23:45:13.45+00:00

That did not work either.:
CJArchie 1 Reputation point

2021-03-18T15:19:05.42+00:00

@Gareth Davies

Nothing in this thread combated the persistence of this issue. I found the answer on Reddit under r/Office365 that resolved it for me.

RE: https://www.reddit.com/r/Office365/comments/l9u8sx/o365_calendar_sharing_issue_you_dont_have/

5 answers

Gareth Davies 276 Reputation points

2021-01-06T21:23:33.053+00:00

We do not have any segmentation or information barriers in place. I have now been made aware the user she is trying to share her calendar with had access but it stopped working, the delegate lost visibility of the calendar so the share permissions were removed. Once this was done she was no longer able to share her calendar with anyone.
Only this one user is affected, others are able to share without issues
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Eric Yin-MSFT 4,386 Reputation points

2021-01-07T07:09:05.657+00:00

How about assigning permissions via powershell, does it work?

Add-MailboxFolderPermission -Identity ayla@contoso.com:\Calendar -User julia@contoso.com -AccessRights Editor -SharingPermissionFlags Delegate

Gareth Davies 276 Reputation points

2021-01-07T16:27:32.653+00:00

Powershell fails too, same error message saying I don't have permission to share the mailbox. I am using a Global administrator account in an EXOPsession

Eric Yin-MSFT 4,386 Reputation points

2021-01-15T09:36:27.25+00:00

If there's only one user affected by the issue, you can try to move it to another DB as a kind of repair: https://gallery.technet.microsoft.com/office/Move-Mailbox-From-One-DB-f6fd6e50

Gareth Davies 276 Reputation points

2021-01-15T14:21:08.777+00:00

The mailbox is an Exchange Online mailbox, that is not an option

Eric Yin-MSFT 4,386 Reputation points

2021-01-18T09:42:03.16+00:00

Actually it's also an option in Online, no need to specify database.
Try reseting the permission to default:

Get-MailboxPermission user| Remove-MailboxPermission –ResetDefault

Gareth Davies 276 Reputation points

2021-01-18T14:14:14.847+00:00

How do you migrate to a different database in EOL? There are no databases listed, there is no database column available to view. There is no option to migrate within EOL, at least no options I can see, I can remote move (import from Exchange on prem to EOL), Staged migration (again from on prem to EOL), cutover (ditto), IMAP migration and GSuite migration. The only other option is migrate back to on prem from EOL.

I reset the permissions, it made no difference, still the same issue.

Andy David - MVP 142.2K Reputation points MVP

2021-01-18T14:30:17.38+00:00

if you run
new-moverequest <mailbox>
in ExO, it may still work, but they have been actively removing that ability for awhile, it may be gone now

https://techcommunity.microsoft.com/t5/exchange-team-blog/disabling-new-moverequest-for-local-mailbox-moves/ba-p/1214776

Gareth Davies 276 Reputation points

2021-01-18T15:04:43.047+00:00

it appears to still be available, though the job has been "waitingforjobpickup" for 15 minutes so it may be they have stopped doing migrations but have not removed the ability to run the cmdlet
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Reinout Depoorter 1 Reputation point

2021-01-30T23:51:14.37+00:00

I'm having a similar issue. Certain users calendars cannot be granted permissions to other users through Powershell add-mailboxfolderperssion. The users themselves can add permissions in Outlook.
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Doug Brewer 1 Reputation point

2021-02-01T16:07:04.517+00:00

I was able to resolve the issue by checking all the users showing to have access to my users calendar. Come to find out one user that was showing no longer existed in O365. I removed the users access using powershell command 'Remove-MailboxFolderPermission' yesterday and upon checking this morning my user now can add users to her calendar permissions in Outlook. I checked OWA since I still have access and I am no longer getting an error there as well.
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CJArchie 1 Reputation point

2021-03-17T00:41:41.683+00:00

@Gareth Davies

Nothing in this thread combated the persistence of this issue. I found the answer on Reddit under r/Office365 that resolved it for me.

RE: https://www.reddit.com/r/Office365/comments/l9u8sx/o365_calendar_sharing_issue_you_dont_have/
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MrA-WAT 1 Reputation point

2021-09-10T11:31:28.647+00:00

A Solution that has worked for me.

I added the shared calendar to Public Folders, instructed my staff accordingly. Once they have accessed the calendar once via the public folders they can then right click on the calendar select add to favourites and then they are able to access the calendar via the normal calendar icon. I found that if they didn't access the calendar in public folders first, they could still access the calendar but the entries lacked detail and only showed as busy.
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