OfficeJet Pro 6978 won't print two-sided

[LisaE_1of3]

I used to be able to print double sided from Windows applications such as Word, Powerpoint and Outlook . However, something has changed where I no longer have the option to select double sided. I have already removed and redownloaded the printer and the app multiple times as well as tried to change the printer settings via the app.  The printer can do double sided when I print from my Iphone. 

[Kumar0307]

@LisaE_1of3, Welcome to the HP Support Community! I’m here to help.

As you are able to print 2-sided from your iPhone, it means the printer is working fine and this is a software issue on the computer.

Use the HP Smart app to print and check if that helps. Check the print settings and set it to Duplex printing.

Run HP Print and Scan Doctor to diagnose and fix any driver issue

Click here to download the file. Once downloaded, make sure to run the file to start the installation and click on 'Fix printing'.

For more info on this issue, refer to - Print on both sides of the paper with an HP printer

Hope this helps! Let me know how it goes. 

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