To add a domain in the Microsoft 365 admin portal, follow these steps:
1. Sign in to Microsoft 365 Admin Center: Open your web browser and navigate to https://admin.microsoft.com/. Sign in using your administrator credentials.
2. Access the Admin Center: Once signed in, you will land on the Microsoft 365 Admin Center dashboard. From here, navigate to the "Setup" section on the left-hand side menu.
3. Go to Domains: In the "Setup" section, select "Domains" or "Add a domain" depending on your view. This will take you to the "Domains" page.
4. Start Adding a Domain: On the "Domains" page, click on the "Add domain" button to start the process of adding a new domain.
5. Enter the Domain Name: In the dialog box that appears, enter the domain name that you want to add to your Microsoft 365 account. This could be a domain that you already own or a new one that you're registering.
6. Verify Domain Ownership: After entering the domain name, you will need to verify that you own the domain. Microsoft provides several methods for domain verification, such as adding a TXT record to your DNS settings, adding an MX record, or uploading an HTML file to your website's root directory.
7. Choose Verification Method: Select the verification method that works best for you and follow the provided instructions to complete the verification process. Once verified, click on the "Verify" button.
8. Complete Domain Setup: After successfully verifying domain ownership, you'll be prompted to complete the domain setup. This involves configuring DNS records for your domain to ensure that services like email and Teams function correctly.
9. Configure DNS Records: Follow the on-screen instructions to add the required DNS records to your domain registrar's DNS settings. These records typically include MX, TXT, CNAME, and SRV records.
10. Finish Adding the Domain: Once you've configured the necessary DNS records, return to the Microsoft 365 Admin Center and click on the "Finish adding domain" button to complete the process.
11. Verify Domain Configuration: After adding the domain, Microsoft will automatically verify the domain configuration. This process may take some time to complete.
12. Start Using the Domain: Once the domain is successfully added and verified, you can start using it with your Microsoft 365 services, such as Exchange Online, SharePoint Online, and Microsoft Teams.
By following these steps, you can easily add a domain to your Microsoft 365 account and configure it to work with your organization's services.
To follow the original Microsoft KB article, click on the link: