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SC-300 · Question #84

Drag and Drop Question You have a new Microsoft 365 tenant that uses a domain name of contoso.onmicrosoft.com. You register the name contoso.com with a domain registrar. You need to use contoso.com…

The correct answer is Add a custom domain name of contoso.com.; Create a new TXT record in DNS.; Successfully verify the domain name.; Set the domain to primary. To use contoso.com as the default domain in Microsoft 365, you must first add the custom domain in the Microsoft 365 admin center, then prove ownership by creating a TXT record in your public DNS (the verification record Microsoft provides), then successfully complete the…

Submitted by lucia.co· Mar 6, 2026Manage Microsoft 365 users and groups / Configure and manage Microsoft 365 tenant settings including custom domain setup

Question

Drag and Drop Question You have a new Microsoft 365 tenant that uses a domain name of contoso.onmicrosoft.com. You register the name contoso.com with a domain registrar. You need to use contoso.com as the default domain name for new Microsoft 365 users. Which four actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order. Answer:

Answer Area

Drag items

Delete the contoso.onmicrosoft.com domain.Add a custom domain name of contoso.com.Set the domain to primary.Create a new TXT record in DNS.Successfully verify the domain name.

Correct arrangement

  • Add a custom domain name of contoso.com.
  • Create a new TXT record in DNS.
  • Successfully verify the domain name.
  • Set the domain to primary.

Explanation

To use contoso.com as the default domain in Microsoft 365, you must first add the custom domain in the Microsoft 365 admin center, then prove ownership by creating a TXT record in your public DNS (the verification record Microsoft provides), then successfully complete the domain verification process, and finally set contoso.com as the primary domain so new users get that suffix by default. This sequence is mandatory because each step depends on the previous one - you cannot verify a domain you haven't added, and you cannot set a domain as primary before it's verified.

Topics

#Microsoft 365 Admin Center#Custom Domain Configuration#DNS Verification#Domain Management

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