Multiple Azure ADs to single custom domain

Avani Patel 1 Reputation point
2022-07-13T10:20:36.117+00:00

I've two Azure ADs and I want to use single custom domain with these 2 Azure ADs. But I'm facing trouble. Can you please help me out.

Or, please let me know if there is any possibility to achieve the same.

Thanks!

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. Vasil Michev 113.5K Reputation points MVP
    2022-07-13T10:45:03.397+00:00

    A given domain can only be used/verified in a single Azure AD instance. You can use subdomains however.
    There is also the so-called "domain sharing" feature currently in preview, but that's only for Exchange Online: https://techcommunity.microsoft.com/t5/video-hub/supporting-mergers-acquisitions-and-divestitures-in-microsoft/ba-p/1681208

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  2. Alfredo Revilla - Upwork Top Talent | IAM SWE SWA 27,491 Reputation points
    2022-07-14T03:44:08.587+00:00

    Hello @Avani Patel , as commented by @Vasil Michev this is not possible. You can however register related custom domain names that describe different purposes, divisions, locations or environments per tenant. E.g.

    contoso-users.com
    contoso-resources.com
    contoso-prod.com
    contoso-test.com
    contoso-us.com
    contoso-latam.com

    You can also register a custom domain name in only one tenant, let's say your user tenant, and target the resource tenant resources (web apps, apis, cdn, databases, queues, etc) using DNS records for the very same custom domain. Users from the user tenant can be invited into the resource tenant. Resources from the resource tenant can access directory objects (users, applications, etc.) from the user tenant and more.

    For more information about managing access between different tenants please take a look to Configure cross-tenant access settings for B2B collaboration and Configure cross-tenant access settings for B2B direct connect.

    Let us know if this answer was helpful to you or if you need additional assistance! If it was helpful, please accept it and complete the quality survey so it helps other community users facing similar issues.

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