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
Multiple Azure ADs to single custom domain
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!
2 answers
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Vasil Michev 113.5K Reputation points MVP
2022-07-13T10:45:03.397+00:00 -
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.
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