Hello Team, I am experiencing an issue with Azure AD Connect in my hybrid environment. I have recently added a new onmicrosoft.com domain to my Microsoft 365 tenant and made Fallback domain. I want to add this domain as an email alias for my users/groups. However, I am unable to sync this new domain as an alias for my Azure AD synced users. Here are the steps I have taken: I added the new onmicrosoft.com domain to my Microsoft 365 tenant. I updated the ProxyAddresses attribute for my on-premises Active Directory users to include the new onmicrosoft.com domain as an alias. I ran a manual sync using Azure AD Connect. Despite these steps, the new onmicrosoft.com domain is not appearing as an alias for my users in Microsoft 365. I understand that the onmicrosoft.com domain is typically used as a fallback domain and is not usually included in the Azure AD Connect synchronization. However, I would like to use this domain as an alias for my users and groups as we are in the process of rebranding our organization. Could you please assist me in resolving this issue? Any help would be greatly appreciated. Thank you, Janak Khadka

Hi @JanakKhadka Thanks for reaching out to Microsoft Q&A Unfortunately, you won't be able to use that approach since any "@*.onmicrosoft.com" address is excluded from the sync by AD Connect because it's a reserved address. https://learn.microsoft.com/en-us/troubleshoot/azure/entra-id/user-prov-sync/proxyaddresses-attribute-populate The doc above has more details about how the proxy and other mail related attributes are populated on Entra ID, for most of them it's just not a simple sync. Let me know if you have any questions. Thanks, Fabio

Issue with Syncing the new "onmicrosoft.com" Fallback Domain as Alias in Azure AD Connect

JanakKhadka 481

Hello Team,

I am experiencing an issue with Azure AD Connect in my hybrid environment. I have recently added a new onmicrosoft.com domain to my Microsoft 365 tenant and made Fallback domain. I want to add this domain as an email alias for my users/groups. However, I am unable to sync this new domain as an alias for my Azure AD synced users. Here are the steps I have taken:

I added the new onmicrosoft.com domain to my Microsoft 365 tenant.
I updated the ProxyAddresses attribute for my on-premises Active Directory users to include the new onmicrosoft.com domain as an alias.
I ran a manual sync using Azure AD Connect.
Despite these steps, the new onmicrosoft.com domain is not appearing as an alias for my users in Microsoft 365. I understand that the onmicrosoft.com domain is typically used as a fallback domain and is not usually included in the Azure AD Connect synchronization. However, I would like to use this domain as an alias for my users and groups as we are in the process of rebranding our organization. Could you please assist me in resolving this issue? Any help would be greatly appreciated.

Thank you,
Janak Khadka

Jayce Yang-MSFT 1,246 Reputation points Microsoft Vendor

2024-04-24T01:49:45.82+00:00

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.

1 answer

Fabio Andrade 640 Reputation points Microsoft Employee

2024-04-08T22:36:56.74+00:00

Hi @JanakKhadka

Thanks for reaching out to Microsoft Q&A

Unfortunately, you won't be able to use that approach since any "@*.onmicrosoft.com" address is excluded from the sync by AD Connect because it's a reserved address.

https://learn.microsoft.com/en-us/troubleshoot/azure/entra-id/user-prov-sync/proxyaddresses-attribute-populate

The doc above has more details about how the proxy and other mail related attributes are populated on Entra ID, for most of them it's just not a simple sync.

Let me know if you have any questions.

Thanks,

Fabio
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JanakKhadka 481 Reputation points

2024-04-09T02:00:07.5566667+00:00

Thank you for sharing your information. I agree that it’s crucial, particularly when companies are planning to rebrand their organization, to have the option to change the ProxyAddresses after adding a new ‘onmicrosoft.com’ domain and making it the fallback domain. This is especially important since users can see all their ProxyAddresses when checking their mail from the Outlook Address Book.

Fabio Andrade 640 Reputation points Microsoft Employee

2024-04-09T22:53:51.4533333+00:00

No problem @JanakKhadka.

Please let me know if you have further questions, otherwise feel free to mark it as responded.

Thanks,

Fabio

JanakKhadka 481 Reputation points

2024-04-16T06:03:28.7266667+00:00

@Fabio Andrade

I have the question, how to get out of this issue? I have the query in the above comments itself.
"When companies are planning to rebrand their organization, to have the option to change the ProxyAddresses after adding a new ‘onmicrosoft.com’ domain and making it the fallback domain. This is especially important since users can see all their ProxyAddresses when checking their mail from the Outlook Address Book."

Fabio Andrade 640 Reputation points Microsoft Employee

2024-04-17T23:15:24.5433333+00:00

Hi @JanakKhadka

Unfortunately, you won't be able to use that approach for your migration endeavor.

This would fall into Exchange Online area, but I found a documentation that contains some information that might be helpful for you.

https://learn.microsoft.com/en-us/exchange/mailbox-migration/migrate-mailboxes-across-tenants

Thanks,

Fabio

Fabio Andrade 640 Reputation points Microsoft Employee

2024-04-19T23:21:28.2033333+00:00

Hi @JanakKhadka

I just wanted to check in and see if you had any other questions or if you were able to resolve your issue.

If you have any other questions, please let me know.

Thanks,

Fabio

Fabio Andrade 640 Reputation points Microsoft Employee

2024-04-22T23:30:18.03+00:00

Hi @JanakKhadka

I just wanted to check in and see if you had any other questions or if you were able to resolve your issue.

If you have any other questions, please let me know.

Thanks,

Fabio

Fabio Andrade 640 Reputation points Microsoft Employee

2024-04-29T22:47:44.2133333+00:00

Hi @JanakKhadka

I just wanted to check in and see if you had any other questions or if you were able to resolve your issue.

If you have any other questions, please let me know.

Thanks,

Fabio
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