Getting "Unable to update the specified properties for on-premises mastered Directory Sync objects or objects currently undergoing migration" error message when updating a room mailbox contact informations on Exchange

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Getting "Unable to update the specified properties for on-premises mastered Directory Sync objects or objects currently undergoing migration" error message when updating a room mailbox contact informations on Exchange

Idriss 26

Hello,

I am new to Exchange, and am still discovering the different ways to manage it (PowerShell : Exchange Management Console, GUI ...).

I joined my company a few weeks ago, and they're based on an Office 365 environnement.

With the new Outlook room finder, I was asked to create a few RoomLists, in which I added the corresponding rooms. (first time using PowerShell !)

The thing is : it works perfectly fine when booking for a room in the Outlook app, or in Teams Calendar (every Room List show properly).
But on Outlook Web, it doesn't show up as I wish it would.

(my Exchange is in french, so the translations I will be using may not be 100% accurate)
I figured it's because room lists are displayed by cities.
So I tried to set a city on a room, on PowerShell. I got a random error.
I found you can manage Rooms informations on Microsoft 365 Admin Center (Resources / Rooms / click on a room / Exchange Settings==> modify).
From there, I went to "Contact informations", and added the city in which my room is.

When clicking "Accept", I get the message that is stated in the title : "Unable to update the specified properties for on-premises mastered Directory Sync objects or objects currently undergoing migration".

From what I have seen, it may be caused by a desynchronization between our Azure Active Directory and our AD.

What could I do ?

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Answer 1

Lydia Zhou - MSFT 2,386 Microsoft Employee

@Idriss

Do you have on-premises Exchange in your organization?
How did you create room mailboxes? Please provide with more details.
Do you mean all room mailboxes you created cannot be displayed from OWA, or this issue only occur with a specific room mailbox?

As AndyDavid mentioned, if your organization uses a hybrid environment and those room mailboxes are synced from AD, you have to manage them from on-premises Exchange.

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Lydia Zhou - MSFT 2,386 Reputation points Microsoft Employee

2020-09-28T07:52:22.53+00:00

Just checking in to see if above information was helpful.
If you have any questions or need further help on this issue, please feel free to post back.

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Idriss 26 Reputation points

2020-10-01T07:16:13.407+00:00

Hi and thank you for your clear, and quick answers.

We do have a hybrid environnement yes.

I didn't create the room mailboxes, only the room lists, which I created with Exchange Online Powershell.

I meant that from OWA every single room mailboxes that doesn't have a city assigned to it doesn't appear.

I am actually making those changes in Exchange Administration Center ! This is where I get this message ...
Lydia Zhou - MSFT 2,386 Reputation points Microsoft Employee

2020-10-01T08:05:55.143+00:00

Do you use EAC from on-premises Exchange or EAC in Exchange Online? It's suggested to modify from on-premises Exchange server instead of Exchange Online.

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Lydia Zhou - MSFT 2,386 Reputation points Microsoft Employee

2020-10-05T08:57:30.967+00:00

Any updates so far?
Please let us know if you would like further assistance.

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Answer 2

Andy David - MVP 157.4K MVP Volunteer Moderator

Hi @Idriss ,

If you are syncing from your AD to Azure ( and you are using AADConnect, yes?)
Then you need to make the changes in EAC on-premises against the local AD. That change will then sync to Office 365.

Answer 3

Bo 61

Hello everyone,

having the same error in slightly different circumstances.

We are in hybrid mode and we lost our local exchange server.
Tried to rebuild it but we cannot get the sync going.
AD sync however works fine.

So i have tried to simply add an email alias in the O365 EAC but i get the same error message.

Is there a way to add email alias(and/or change default smtp reply address) without the local exchange?

KT 6 Reputation points

2022-01-13T08:36:41.46+00:00

Yes, you can use "Active Directory Users and Computers" on your domain controller to modify the "proxyAddresses" attribute of the user directly.
Add "smtp:name@Company portal .com" for a new alias or "SMTP:name@Company portal .com" for a default reply address.

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Getting "Unable to update the specified properties for on-premises mastered Directory Sync objects or objects currently undergoing migration" error message when updating a room mailbox contact informations on Exchange

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