Thank you for using the Support Forum. Please make sure you are following the instructions in the solution for printing on envelopes. Also make sure your envelopes are plain and do not have a coating of any kind. If this does not help please consider contacting your support centre for further assistance.
Thanks, CherylO-Xerox Community Manager
Be sure to click Kudos for those who have helped you. Select Accept as Solution for posts that have helped to solve your issue(s)!