AWS Certificate Manager (ACM) Private Certificate Authority (CA) now supports customizable certificate subject names. Security and public key infrastructure (PKI) administrators, builders, and developers now have greater control over the types of certificate subject names they can create using ACM Private CA. For example, it’s now possible to represent your organization’s directory structure in certificates by including multiple organizational units (OUs) in your certificate subject names. It’s also possible to create subject names representing Internet of Things (IoT) product and vendor identifiers such as those conforming to Matter, a new industry standard for secure and reliable home automation devices.
Source:: Amazon AWS