Perform these steps in the Azure AD Tenant:
- Navigate a browser to https://portal.azure.com.
- Log in with an account in Azure Active Directory that has the Global Administrator role assigned.
- Perform multi-factor authentication when prompted.
- In the left navigation pane, click Azure Active Directory.
- In the Azure AD pane, click Custom domain names:
- In the top bar, click + Add custom domain.
The Custom domain name blade appears on the right.
- Enter the name of the DNS domain name that you want to federate.
- Click the Add domain button at the bottom of the blade.
You are then taken to the Custom domain name pane to verify ...