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I have the same issue with a ColorCube 8570. Two days ago, all Users were not able to print 2-sided. Yesterday, I found this post and did the NVRAM reset which then allowed them to print 2-sided without issue. This resolution was short-lived however as this morning these same users are again unable to print 2-sided.
Unfortunately, the supprt contract for this printer expired in January so I can't call Xerox to troubleshoot. I am concerned that it may be hardware related but since the printer is just over a year old, I am hoping that isn't the case.
Any thoughts as to what the root cause might be and possible fixes would be appreciated!
Go to the printer's menu screen. Choose "Paper Tray Setup", then "Tray 2 Paper Type". Once there, check to see that you have "Plain Paper" If it says "Card Stock" or something different, change it to Plain Paper -- something the printer can print in duplex.