Add a Custom Domain

Add a Custom Domain, an IT Pro Challenges virtual lab, gives learners an overview of adding and removing their personalized domain. Knowledge gained from this virtual lab benefits technical support and system administrators, by showing how to make network servers and their services records available to users.

1 hour
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This thirty-minute guided lab teaches beginners how to add their own domain, set up services like Skype for Business, through the domain, and to remove the domain. In this scenario, the domain is one different from that used to establish and manage Office 365 tenancy.

Learners must complete the Provisioning an Office 365 E5 Trial Subscription lab first, to get an Office 365 tenant, required to add a customized domain. This virtual lab falls under the Microsoft 365: Identity and Services Challenge Series. The lab does not provide a public Domain Name Server (DNS) service to verify the domain; however, participants will be able to see how to add online services to the custom DNS and review and check the records display correctly.

Add a Custom Domain:

After signing in to the Microsoft Office 365 admin center, learners will use its features to create a custom domain. At the end of the lab, the custom domain will be checked to see that it exists. Lab takers will see, hands-on, that domain verification fails without a valid DNS service and the corresponding warning in this case.

Businesses use custom domains for marketing their brands and keeping the integrity with their customers. If had a different domain, say, then others would be confused as to whether was actually a Google site or a fake. So IT managers need to know how to add a custom domain with the correct information.

Review the Process Used to View Service Records for the Domain:

This exercise shows learners how to use the DNS Management wizard to update online services so that emails, contacts, schedules, and other communications can be shared among other employees and modified. Through the example provided by the lab, learners review what public DNS records need to be attached to the domain. However, should the public DNS be commercial, Microsoft Office 365 suggests recommended records and allow you to add them.

Remove the Custom Domain:

As a final exercise, learners will remove the custom domain they created using the Microsoft Office 365 admin center. They will verify a box appears, asking them to confirm custom domain deletion. Erasing a custom domain, in use, will cause office applications like Outlook and Skype for Business to generate warnings and errors when users open the apps and then try to send or receive communications from other employees. So, removing a custom domain, in existence for some time, needs to be done with care.


This hands-on lab demonstrates how to add and remove custom domains. Also, the lab will teach learners how to set-up online services, necessary for business communications, to a specific domain. This lab, along with others, complete the Microsoft 365: Identity and Services Challenge Series. Other sessions include six guided and three advanced challenges, in addition to an expert experience.

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