Double sided printing not working with new 24" iMac running Sonoma 14.4.1 and Epson ET-4750

Help! Finally upgraded my very old iMac and now it won't print 2-sided anymore. I have the double-sided button checked, but it just doesn't do it.... Can't find any other settings to check. Used to work just fine. (Also don't seem to have a "draft" option anymore and all printing seems to be at "best" quality, regardless of what I choose, which is Ok i guess, but SLOW.) Any tips welcome!