If it works for copy, it will for print, so if print doesn't work and copy does, it is 100% going to be a driver problem.
If you use a Mac I would guess the driver/ppd you have is old or incorrect (usually it will say Generic PS)
In any case, totally remove and reinstall it using the latest drivers on Xerox.com
Windows is here for x86, and here for x64, Mac is here
Thank you for using the Support Forum. Please take a look at the solution for printing duplex. Also make sure the duplex unit is installed correctly. If the problem continues please consider contacting your support centre for further assistance.
I have a Work Center 3220 which has the ability to print in duplex mode.
This feature used to work properly but for some reason it does not function anymore.
Everything works just fine, no paper jamming, no problem, but when I set it to print in Duplex mode, the printer will just print on 2 sheets of paper instead of 1 on both sides.
I tried many things like reinstalling the driver or try a manual duplex copy, nothing works. It is like the duplex unit is not there but it is ...
If any of you has an idea that would be a great help.
Many thanks in advance !!