I have not attempted this deployment but I'm happy to help you figure it out. My first suggestion is to test your deployment method via command prompt outside of software dist first, to ensure it's working and you have the right switches. once that's validated we can build the ivanti package and get it going.
- Download the Skype for Business retail and extract it to a [directory]
- Start the setup with /admin parameter (to configure parameters)
- Make the required settings and save it to a .msp file
- Install the setup with commandline [directory]\setup.exe /adminfile [directory]\Updates\Skype.MSP