Windows 10 machine can print no problems. When Fax is selected, Windows 10 just prints the document instead of fax. MacBook on the other hands works like a champ. I'm completely stumped at this point. Where can I start.
Assuming you are sending a fax with the print driver to a Xerox MFP, I'd start with installing a Xerox V3 driver and getting rid of the Microsoft V4/Class driver you have now.