Issues with Managing Aliases in O365 Hybrid AD Setup

Question

In my O365 users -> Manage username and email, I am unable to add Aliases or see previously created Aliases in my mail account. My O365 is Hybrid AD joined with Azure and displays the information: "This user is synchronized with your local Active Directory. Some details can be edited only through your local Active Directory."
I have some queries regarding this setup:

1. Why were all of my aliases deleted after the Hybrid AD Sync?
2. How can I recreate those aliases with my current Hybrid setup?
3. How can I prevent the deletion of aliases for those AAD sync user accounts?

Answer 1

Hi @Deepu K , It's possible that the aliases were deleted during the Hybrid AD Sync due to a configuration issue or a synchronization error. To recreate the aliases you can add them back to the user's on-premises Active Directory account and then perform a synchronization to Azure AD. Once the synchronization is complete, the aliases should be visible in the Office 365 portal.

To prevent the deletion of aliases for AAD sync user accounts, you can configure the synchronization rules to exclude the proxyAddresses attribute from synchronization. This will make sure that any aliases added to the on-premises Active Directory account will not be deleted during the synchronization process.

Please let me know if you have any questions and I can help you further.

If this answer helps you please mark "Accept Answer" so other users can reference it.

Thank you,

James