How I can add mail alias (second address) for O365 account that has been synced with the local AD system?

Question

I have one account in my local AD which has been synced with Azure AD cloud.
I need to add another (alias) email to it's account but got the error in ExO:

"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: Exception happened when doing AAD dual-write.'

I have no Exchange in my local AD.

How I can add additional email addresses to synced accounts like that?

Answer 1

Hi @Allan Stark ,

go to AD User and Computer, find the user, doubleclick -> attribute editor -> find "proxyAddresses".
add the address

NOTE:
if there are no values at all in the attribute, please add the value like this:
SMPT:primaryEmail@yourdomain.com
smpt:emailyouwanttoadd@yourdomain.com

every further email needs to be added with "smtp:thenyourmail@yourdomain.com"

as Andy already said - this is not supported from Microsoft. But it works very well ;-)

Answer 2

This has been done but emailing an address with smtp:emailyouwanttoadd@yourdomain.com causes all email to arrive as it being sent to SMPT:primaryEmail@yourdomain.com.

When somebody emails the secondary email, emailyouwanttoadd@yourdomain.com, it gets delivered to the primary email but the TO field changes to the primary email.

How to configure it so, when one emails emailyouwanttoadd@yourdomain.com it says so in the TO: field but still gets delivered to primary?

Answer 3

I have Edit the Email id but not reflected in Office 365 portal, how much time taken for synchronization.