Duplex printing on Epson ET-4750 not working after upgrade to Big Sur.
Since upgrading my system to Big Sur on my 2017 iMac, I can no longer print on both sides of the paper using my Epson ET-4750 printer. The printer is connected via wi-fi and has worked flawlessly up until now. No matter the application I use—Papers, Affinity Publisher, Skim, etc.—my printer only prints on one side of the paper. I know that I have set the printer parameters correctly, as I use presets. Printer drivers and software are up to date. Apparently [as far as I can tell] Epson does not have a support network, so I cannot submit anything to them.
Any suggestions/advice would be most greatly appreciated!
iMac 21.5″ 4K, macOS 11.1