Final answer:
Attempting to add servers in a Workgroup to Server Manager will fail because Server Manager requires servers to be part of a domain for centralized management. Workgroup servers lack the necessary trust relationship and shared directory infrastructure, thus needing to be managed individually using local administrative credentials.
Step-by-step explanation:
When you attempt to add servers that are in a Workgroup rather than a domain to the Server Manager, the process will be unsuccessful. Server Manager is designed to manage servers that are part of a domain. In a domain environment, servers share a common directory database managed by Active Directory. This enables administrators to manage multiple servers and their roles centrally. However, servers in a workgroup do not have this shared directory infrastructure and are managed separately.
Trying to add a Workgroup server to the Server Manager results in errors because the Server Manager relies on domain-based authentication mechanisms for managing servers. Workgroup servers do not have the necessary trust relationship with the domain that allows for centralized management via Server Manager. To manage these workgroup servers, administrators must access them individually, using local administrative credentials instead of domain credentials.
If centralized management is a requirement, the recommended solution is to join the servers to the domain first before attempting to manage them with Server Manager. Once they are part of a domain, they can be easily added and managed from the Server Manager's console.