The following article describes how to enable PowerShell SSO commands:
The documentation is not correct. I cannot find a relevant post to the issue.
Has the SSO feature been deprecated from the current AzureAD implementation, or, do the documents need to be updated to reflect a different module include statement. The module mentioned does not appear to exist.
install Azure AD PowerShell.
Browse to the %programfiles%\Microsoft Azure Active Directory Connect folder.
Import the Seamless SSO PowerShell module by using this command: Import-Module .\AzureADSSO.psd1.