Hi Brenda,
Yes, My issues with duplex are resolved with HP 4650.
if you read thru this entire thread, i think you’ll get enough info to help resolve the issue. On my MS Word, I saw something like Print on both sides manually above the place where you select long edge or short edge for duplex. My printer was Device Settings Used/connected and using a ‘WSD...’ PORT - setting up and selecting a new PORT with Standard TCP/IP using IPaddress of printer and disabling shared spooling - worked for me - I did have to update installable options(instructions in thread). I did not need to uninstall and reinstall printer - just reconfigured w/TCP/IP and restarted MS word.
I still think a Win 10 install in fall 2019 messed up printer setup because it had been working fine until then. I’m not a super techie but know enough to almost get myself in trouble! The other folks on thread are the experts. Thinking, This issue may be prevalent with HP printers from what i’ve read.
Good Luck!