License & Subscription Issues

Can One Microsoft 365 Subscription Use Multiple Domains?

Camila Milosovich Sep 25, 2026 868 views

Question details

The user wants to know if it is possible to add and manage multiple custom domains using just one Microsoft 365 subscription, and whether an additional subscription is required for new domains.

Can One Microsoft 365 Subscription Use Multiple Domains?

Product: Microsoft 365
Device & OS: not provided
Scenario: Adding another custom domain to an existing Microsoft 365 tenant.
Observed behavior: The user needs clarification on licensing rules when configuring an additional custom domain within the Microsoft 365 admin center.

Before you start

Ensure you have global administrator privileges in your Microsoft 365 admin center and access to the DNS records of the new domain you wish to add.

Solution 1Recommended

Add an Additional Domain to Your Existing Subscription

You can add and verify multiple custom domains under a single Microsoft 365 tenant without needing a separate subscription.

Microsoft 365 allows you to host and manage multiple custom domains under a single tenant and subscription. This is especially useful for businesses managing multiple brands or web properties. While you do not need to purchase a new subscription just to add the domain, you must ensure that any new users created on that domain are assigned a paid license.

Log in to the Admin Center

Navigate to Domain Settings

In the left-hand navigation menu, select 'Settings' and then click on 'Domains'.

Add the New Domain

Click the 'Add domain' button, enter your new custom domain name, and click 'Use this domain'.

Verify Domain Ownership

Follow the on-screen instructions to verify the domain by adding the provided TXT or MX records to your domain's DNS hosting provider.

Assign User Licenses

If you are creating new employee email accounts for this domain, navigate to 'Users' > 'Active users', add the new user, and assign an available Microsoft 365 license to them.

Add an Additional Domain to Your Existing Subscription

Licensing Requirement: You do not pay for the domain itself within Microsoft 365, but each new individual user who needs access to Microsoft 365 services (like an Exchange mailbox or Office apps) must have an appropriate paid license.

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Frequently Asked Questions

Do I have to buy a new subscription to add a second domain?

No, you do not need a new subscription just to add a second domain. You can manage multiple domains under your existing Microsoft 365 tenant. You only need to purchase additional licenses if you are adding new users.

Can one user have email addresses from multiple domains?

Yes, a single user can have multiple email aliases across different domains within the same Microsoft 365 tenant without requiring an extra user license.

How many custom domains can I add to Microsoft 365?

Microsoft 365 allows you to add up to 5,000 custom domains to a single tenant, provided you own the domain names and can verify them via DNS.

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