Change Forest name for a M365 synced on prem AD

Andrea Ardemagni 20 Reputation points
2024-01-16T13:22:46.2366667+00:00

Hello, the situation is this: My company runs on an on-prem active directory with primary domain domain.local. We were able to add UPN suffix domain.com, assign it to all users and sync them over Entra and Microsoft 365 (we don't have any local exchange, all mail are managed on cloud). We now need to change the local domain primary suffix to domain.com, are there any concerns about changing the domain name while the users are synced or it is simple as using directly the rendom functions? Thanks

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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  1. Thameur-BOURBITA 35,511 Reputation points
    2024-01-16T14:35:09.6066667+00:00

    Hi, @Andrea Ardemagni @Andrea Ardemagni

    Since you don't have an on-premise Exchange infrastructure, you can rename your domain. You have backup your forst in case of problem.

    https://woshub.com/rename-active-directory-domain/

    Renaming a forest is risky operation. You can avoid it by adding a additionale DNS zone domain.com on local DNS server and create UPN suufix for domain.com (it's alreday done for your case) When the renaming is completed without issue , the synchronisation with Entra ID should works automaticcaly because Entra connect server matchs user objects in Entra ID and AD based on mail ,UPN or msd-consystencyGUID.


    Please don't forget to accept helpful answer

    1 person found this answer helpful.

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