To setup Department ID's for printing on a Canon MFD in macOS:

1. Navigate to your Applications folder, open System Settings and launch the Printers & Scanners preferences pane
2. Select the Printer by clicking the ">" next to the name. Click on Print Queue to open up Print Center (If you have multiple printers, make sure you have selected the correct one.) 
3. Click on the "i" icon at the top right of the window.
4. Click the Options tab and ensure the following is toggled on:
   
   
   
   
5.  Select the Utility tab and click the Open Printer Utility button
   
   
   
6. From the User Management: dropdown, select Department ID Management
7. Enter your department ID in the Department ID field and click Save Settings