Instalar el certificado pfx como machine-wide el el contenedor Personal y obtener el thumbprint

# Make sure to replace `<your certificate subject>` at {$_.Subject -like "*.bccba.org.ar"} with the subject name of your SSL certificate.
 
Get-ChildItem Cert:\LocalMachine\My | Where-Object {$_.Subject -like "*.bccba.org.ar"} | Select-Object -ExpandProperty Thumbprint

Se puede ver el thumbprint en los detalles del certificado, directamente haciendo doble click y yendo a la solapa Details > Thumbprint.

Esto tendría que hacer lo mismo que la instalación manual

#$mypwd = Get-Credential
#Import-PfxCertificate -FilePath C:\path\to\cert.pfx -CertStoreLocation Cert:\LocalMachine\My -Password $mypwd.Password

Este snippet instala el certificado con el thumbprint que se indica

$cerThumb = "12345678123456781234567812345678"
 
$ConnectionBroker = Get-RDServer -Role RDS-CONNECTION-BROKER
 
Set-RDCertificate -Role RDRedirector -Thumbprint $cerThumb -ConnectionBroker $ConnectionBroker.Server -Force
Set-RDCertificate -Role RDGateway -Thumbprint $cerThumb -ConnectionBroker $ConnectionBroker.Server -Force
Set-RDCertificate -Role RDWebAccess -Thumbprint $cerThumb -ConnectionBroker $ConnectionBroker.Server -Force
Set-RDCertificate -Role RDPublishing -Thumbprint $cerThumb -ConnectionBroker $ConnectionBroker.Server -Force