What must an administrator do to log in to the vSphere Client and view inventories from two vCenter Server instances?

The correct course of action for an administrator to log in to the vSphere Client and view inventories from two vCenter Server instances is to connect each vCenter Server instance to the same vCenter Single Sign-On (SSO) domain during deployment. When both vCenter Servers are part of the same SSO domain, they can share authentication and authorization information. This setup allows users to log in to a single vSphere Client interface and seamlessly manage multiple vCenter Servers, thus streamlining operational processes.

When vCenter Servers are in the same SSO domain, it enables enhanced functionality such as Enhanced Linked Mode, which provides a single pane of glass for managing multiple vCenter Servers and their associated inventories. This approach simplifies user management, making it easier for administrators to maintain and oversee multiple environments without the need for separate credentials for each vCenter.

While configuring Enhanced Linked Mode and connecting through the vSphere Client are related concepts, they rely on the foundational requirement of being in the same SSO domain. Additionally, the vCenter Server Management Interface is a tool for configuration and troubleshooting rather than a method for logging in or viewing inventories across multiple vCenter instances. This makes connecting each instance to the same SSO domain the core requirement for achieving the stated objectives.