The PowerShell module VMware.vSphere.SsoAdmin is a combination of .NET binary libraries that provide access to vSphere SSO Admin APIs, along with PowerShell advanced functions that offer a cmdlet-like interface for vSphere SSO Admin features. This module is released as an Open Source project, meaning it is not an official release from VMware by Broadcom.
VMware vSphere 6.x
VMware vSphere 7.x
VMware vSphere 8.x
VMware PowerCLI
Currently, there is no officially supported method to manage SSO users through PowerCLI.