The customer has the package service installed on his SMP. It seemed to be running correctly but it was not publishing https codebases. The respective HTTPS codebases settings have been enable as per:
When running SMP and Site Server on the same host you can/t override the certificate used on the Site Server. The issue is that you'd have two web servers binding to port 443 using two different certificates. This is why it failed.
ITMS 8.0, 8.1