The following assumes the Full Feature Software has been installed and is functional.
Load the paper / envelopes according to the instructions in the User Guide
Pay attention to flap location and rotation.
Check / Modify the paper settings on the printer display panel, in the Embedded Web Server (EWS), and in Printing Preferences.
How to check / adjust paper size / type setup
Printing envelopes in Word > Mailings > Envelopes
Preferences are not directly involved when printing envelopes from Word.
That said, make sure your preferred shortcut in Preferences is set to Everyday Printing as opposed to a booklet or photo printing shortcut selection.
When not a sensor issue,
If the envelope prints incorrectly (or not at all) in spite of correct and proper size, tray, and rotation selection,
Treat the envelope as if it is a "Custom Size" envelope.
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