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After Recent AD Sync to Azure, Cannot Manage Exchange Online Accounts

We just recently sync'ed our AD domain with Exchange Online. Our Exchange had been migrated over a year ago and we have no on-premise Exchange any longer. In the portal, I tried to set a primary SMTP address, and received this error:

The operation on mailbox "John Smith" failed because it's out of the current user's write scope. The action 'Set-Mailbox', 'EmailAddresses', can't be performed on the object 'John Smith' because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization.

Our DC's Windows Powershell doesn't support that command. I'd have been surprised if it did.

This is probably relevant- we performed the Sync by changing UPN's on user accounts. The sync works like a charm. But we need to be able to manage accounts.
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jconklin-ansinc-net
Asked:
jconklin-ansinc-net
1 Solution
 
Vasil Michev (MVP)Commented:
That's the whole idea of the sync - you transfer the source of authority to you on-prem AD and any changes in objects and their attributes should be done on-prem. That's also the reason why the only supported configuration is by having an Exchange server on-prem. If you dont have such server, you can still edit the attributes via ADUC/ADSI Edit/PowerShell, however you will be in unsupported scenario.

If you're only concerned about the primary SMTP address, there's a workaround. You can use the following cmdlet to change it directly in the cloud:

Set-Mailbox user@domain.com -WindowsEmailAddress new@domain.com

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This cmdlet will add new@domain.com as the primary SMTP, while preserving user@domain.com as a secondary alias. It will work regardless of the object's sync status.
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jconklin-ansinc-netAuthor Commented:
The Powershell command worked. Thanks!
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