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Can One Microsoft Entra ID Tenant Support Multiple Domains?

Maira Mehtab Sep 28, 2026 869 views

Question details

The user is asking whether it is possible to configure and manage multiple custom domains within a single Microsoft Entra ID tenant.

Can One Microsoft Entra ID Tenant Support Multiple Domains?

Product: Microsoft Entra ID
Device & OS: not provided
Scenario: An organization wants to consolidate multiple brands, subsidiaries, or newly acquired company domains into a single centralized identity management directory.
Observed behavior: The goal is to seamlessly manage user accounts and organizational identities from several different domains under one unified Microsoft Entra ID directory.

Before you start

Ensure that you have Global Administrator or Domain Name Administrator permissions in your Microsoft Entra ID tenant, and that you have access to update the DNS records for the domains you intend to add.

Solution 1Recommended

Add and Verify Multiple Domains in Your Tenant

Microsoft Entra ID fully supports adding multiple verified custom domains to a single tenant, allowing unified directory management.

A single Microsoft Entra ID tenant can support multiple verified custom domains. This allows an organization to manage identities across multiple domains in a single centralized directory.

To accomplish this, you must add each custom domain to your tenant and verify ownership by updating your DNS settings.

Sign in to the admin center

Navigate to domain settings

In the left-hand navigation pane, go to Identity > Settings > Domain names > Custom domain names.

Add the custom domain

Click on 'Add custom domain', type in the name of your new domain, and select 'Add domain'.

Verify domain ownership

Copy the provided TXT or MX record information and add it to your domain's DNS zone files at your domain registrar. Once the DNS records propagate, click 'Verify' in the Entra admin center.

Configure Microsoft Entra Connect (if hybrid)

If you are syncing users from on-premises Active Directory, review the official Microsoft Entra Connect guidance to ensure your routing and User Principal Names (UPNs) are correctly configured for multiple domains.

Add and Verify Multiple Domains in Your Tenant

Configuration Assistance: If you encounter specific configuration issues, post your question in the Microsoft Entra ID Microsoft Q&A community where specialists can provide targeted assistance.

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Frequently Asked Questions

Is there a limit to the number of custom domains a Microsoft Entra ID tenant can support?

Yes, a single Microsoft Entra ID tenant can support up to 5,000 custom domains. However, if your tenant uses the free edition, this limit is capped at 900 custom domains.

Can I use the exact same custom domain across multiple Microsoft Entra ID tenants?

No, a specific custom domain can only be verified and associated with one Microsoft Entra ID tenant at a time. To use a domain in a different tenant, you must first remove it from the original tenant.

Do I have to verify the domain before I can create users under that domain name?

Yes, you cannot assign a custom domain name to users or groups until you have successfully verified domain ownership by adding the required DNS records (TXT or MX).

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