Hybrid domain update with additional domain

Dee, Robert 1 Reputation point

Hi, Currently we have two domains in house. Domain #1 (domain.com) is in an local domain/Office 365/Azure hybrid solution. There is a AD Sync server that syncs our changes every 30 minutes or so to Azure. Domain #2 (subdomain.domain.com) has no connection with domain 1. We would like to add domain #2 to our current hybrid solution so we can move the students to Office 365 email from their current provider. Ultimately we would like to have domain two added to the Office 365 tenant so we can give them @doamin.com address vs @subdomain.domain.com addresses. I know multiple sync servers aren't supported from my research.

I am wondering if I need to do a trust between the domains then update the Sync to include the new domain. Not entirely sure so I am seeking guidance on my best approach.

Disclaimer: I wasn't involved with the installation of the original setup of the hybrid deployment. So I don't know much about this. From what I see we have an AD FS server and a AD Sync server.

Thanks in advance

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. ANUBHAV ADHYAYAN 81 Reputation points

    I think you should use domain.com and verify it on your tenant . There is no concept of trust between azure ad tenants similar to onprem windows environments . I think for new domain you will need to verify the domain on your Azure ad tenant . After you verify domain.com subdomain.domain.com is added automatically . And then you can sync the users to the cloud using Azure ad connect . After this licenses can be assigned to the users ..

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