What is the Access Control Service?
The Microsoft Azure Access Control Service (or ACS) is a cloud-based service that provides a way of authenticating and authorizing users to gain access to web applications and services.
Changes to How Access Control Service Namespaces are Created
New ACS namespace creation will be restricted starting June 30th, 2017. If you need to create an ACS namespace beyond this date, you will need to call Azure customer support.
Azure Active Directory (Azure AD) and Azure AD B2C
ACS functionality is fully supported for existing namespaces. However, the future of ACS is Azure Active Directory. We are committed to improving and updating Azure Active Directory to natively support many of the scenarios enabled by ACS. We encourage you to explore the offerings that Azure AD B2C can provide today.
If you have questions or feedback about these changes or ACS in general, please do not hesitate to contact us at firstname.lastname@example.org.