HP LaserJet M140w not listed as supported model

I did not see the HP LaserJet M140w listed as supported model on the Developers HP Linux imaging and printing supported devices index: https://developers.hp.com/hp-linux-imaging-and-printing/supported_devices/index I am however finding that it works using a program called Document Scanner and HP Device Manager Version 15.0 (QT4) with HPLIP Software Version 3.22.10 Printing. I'm finding that I am unable to select an option to print on both sides of a sheet. Im able to do so by following on screen prompts when using a windows computer print function. Any idea what i'm missing?