PowerShell and network printer settings

Setup:

• Xerox 7845 WorkCentre Copier attach to the local network
• Windows print server running on Windows 2008 R2. Printers are pushed out via Group Policy.
• Clients PCs are Win10 and Win7

Goal:

• Set printer default to black and white printing for client PCs

Problem:

• Setting default isn't working thru print server - I can force black and white only printing, but cannot push a default setting of black and white printing.

• Use PowerShell... right? Setup a locally run script on boot/login to change default printer setting to black and white.

Using Get-Printer, Get-PrintConfiguration, Set-PrintConfiguration work fine with local printers like 'XPS Doc writer' and 'Adobe PDF'. When trying Get-PrintConfiguration or Set-PrintConfiguration on a network printer the response is 'sprecified printer not found' and 'access denied'...