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TravisR-7845 avatar image
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TravisR-7845 asked joyceshen-MSFT commented

Editing Email and Alises in Hosted Microsoft 365 Exchange

When trying to add address to users via the Microsoft 365 Admin panel, I keep being presented with the following error:

"Error executing request. An Azure Active Directory call was made to keep object in sync between Azure Active Directory and Exchange Online. However, it failed. Detailed error message: Unable to update the specified properties for on-premises mastered Directory Sync objects or objects currently undergoing migration. DualWrite (Graph) RequestId: 3ddd4076-c4d1-4bc3-a25d-bbb2ed3350e7 The issue may be transient and please retry a couple of minutes later. If issue persists, please see exception members for more information."

I've Goo..., I mean Bing'ed for a solution, but they all refer you to making the required changes in your on-prem exchange ecp.

However, there is no on-prem Exchange Server.
Only Hosted Microsoft 365 Exchange.

Anyone have any advice?

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joyceshen-MSFT avatar image joyceshen-MSFT ·

Hi @TravisR-7845,

You can use "Active Directory Users and Computers" on your domain controller to modify the "proxyAddresses" attribute of the user directly.

Just like the introduction here: 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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joyceshen-MSFT avatar image joyceshen-MSFT ·

Hi @TravisR-7845,

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michev avatar image
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michev answered

This is relevant to any configuration that involves dirsync (Azure AD Connect), it's not specific to just scenarios where you have Exchange server on-premises. Make the changes in AD, they will get replicated to Exchange Online.
If for some reason you don't want to make them in AD, you can use the following cmdlet as a workaround:

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

This will add new@domain.com as the primary SMTP address, while preserving user@domain.com as secondary one, and will also work for synced users. However, such changes can potentially be overwritten, so again - best make the change on-premises.

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