One certificate with multiple domain names
Active Directory Certificate Services
Enterprise Root
FQDN of Domain Controller: MSIR2.test.com
I want that IIS server on this domain controller can be accessed by https://www.test.com, https://sharepoint.test.com, and https://msir2.test.com.
Duplicate the Domain Controller template



Open Certificates snapin:

Request New Certificate
Click “Next” button
Select “Active Directory Enrollment Policy” and click “Next” button


Click “OK” button

Click “Enroll” button

All three https:// addresses work fine.

Make sure that DNS records are created for www.test.com and sharepoint.test.com.