second domain

Question

We have purchased two domain names. One for our senior living company and one for our human services company. Can I add a second domain to my account?

Answer 1

Hi @La Dena Goldsmith,

Welcome to the Microsoft Q&A forum.

Thank you for reaching out regarding your question on adding a second domain to your Microsoft 365 account.

After reviewing the details you shared and the official documentation from Microsoft, it appears that the information provided by the Q&A Assist aligns with Microsoft 365’s supported behavior. A single Microsoft 365 tenant can have multiple custom domains added and verified. Once verified, both domains can be used within the same tenant, and users can be assigned email addresses associated with either domain as needed.

Additionally, if you are referring to adding a domain to another account with a different domain (for example, using a second account in Outlook). In this case, in the Outlook desktop app, you can add multiple email accounts even if they belong to different domains and use them at the same time within the same Outlook application. Each account remains separate, with its own mailbox, folders, and calendar, and you can choose which account to send from when composing emails.

In Outlook on the web, however, only one account can be signed in per browser session. To work with another account that uses a different domain, you would need to use a separate browser profile.

I hope this information is helpful. Please follow the guidance and reference links provided and let me know whether this addresses your question. If not, feel free to leave a comment under this post and we can work together to explore this further.

Thank you for your patience and understanding. If you have any additional questions or need further assistance, please share them in the comments so I can continue to support you.

I look forward to continuing the conversation.

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Answer 2

Yes. A Microsoft 365 tenant can have multiple domains, so both company domains can be added and used in the same account.

Key points:

1. Multiple domains are supported
   • A single Microsoft 365 subscription can typically have up to thousands of domains added.
   • Users can have email addresses on any of the domains that are added and verified.
2. How to add the second domain
   • In the Microsoft 365 admin center, go to the setup page and select Get your custom domain set up → Manage → Add domain.
   • Enter the second domain name (for example, yourhumanservicescompany.com) and select Use this domain.
   • Verify ownership of the domain either automatically (if your registrar supports it, such as GoDaddy) or by manually adding the DNS records provided.
   • After verification, choose which Microsoft 365 services (email, Teams, etc.) to use with that domain and complete DNS configuration as instructed.
3. Using both domains
   • Once both domains are added and verified, user accounts can be assigned email addresses on either domain (for example, ******@seniorliving.com and ******@humanservices.com).
   • You can keep the original onmicrosoft.com domain as a fallback; it cannot be removed but does not have to be used for email.

For detailed steps, see the guidance for adding a custom domain and adding existing domains during setup.

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References:

• Add a custom domain name
• Domains FAQ
• Set up Microsoft 365 Business Standard with a new or existing domain
• Step 1: Create your Office 365 tenant account.
• Add a custom domain to Microsoft 365