Этот модуль Microsoft был поставлен с WMF 5.0 для Windows 10
Если вы посмотрите на детали модуля, он не совместим ниже Powershell 3.0:
@{
GUID="{cf094c6b-63d1-4dda-bf70-15a602c4eb2b}"
Author="Microsoft Corporation"
CompanyName="Microsoft Corporation"
Copyright="© Microsoft Corporation. All rights reserved."
ModuleVersion="1.0.0.0"
NestedModules="Microsoft.CertificateServices.PKIClient.Cmdlets"
TypesToProcess = 'pki.types.ps1xml'
HelpInfoUri="http://go.microsoft.com/fwlink/?linkid=390811"
PowerShellVersion='3.0'
CLRVersion='4.0'
CmdletsToExport = @('Add-CertificateEnrollmentPolicyServer', 'Export-Certificate', 'Export-PfxCertificate', 'Get-CertificateAutoEnrollmentPolicy', 'Get-Certificate', 'Get-CertificateNotificationTask', 'Get-CertificateEnrollmentPolicyServer', 'Get-PfxData', 'Import-Certificate', 'Import-PfxCertificate', 'New-CertificateNotificationTask', 'New-SelfSignedCertificate', 'Remove-CertificateNotificationTask', 'Remove-CertificateEnrollmentPolicyServer', 'Set-CertificateAutoEnrollmentPolicy', 'Switch-Certificate', 'Test-Certificate')
}