I'd like to set up Azure AD Domain Services on an Active Directory tenant that I created. This is only for test purposes and I don't expect to add more than a handful of test users to AD so I can access it through LDAP. It asks for a subscription to be linked.
What kind of subscription should this be? A regular Azure subscription (compute service) or some special Azure AD subscription?
Also, is it possible to use Azure AD DS on a free subscription/trial?