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.

Correct Answer:

1 - Register a custom domain name of contoso.com
2 - Create a new TXT record in DNS.
3 - Verify the domain name.
4 - Set the domain to primary.
Reference:
https://practical365.com/configure-a-custom-domain-in-office-365/