Cannot print two-sided after installing Mojave

I've read this same topic at https://discussions.apple.com/thread/8627728 with the title Lost duplex printing after Mojave Installation, but there is not an answer that works. I've tried NOT installing the Epson printer drivers and letting Mac OS install the printer itself, which is the recommended method from Apple and there is NOT a 'two-sided' option to pick from when in the printer options menu. I've also tried installing Epson's drivers and get the same result - NO two-sided printing option. Two-sided printing is turned off and there is NO where to turn it back on. I've also spent over an hour on the phone with Apple support and NOT resolved the problem. Epson says you can't print two-sided on some types of paper, but you can print two-sided on plain paper. I've set 'plain paper' as the choice in the printer features screen and still two-sided printing does NOT show in the printer options settings in system preferences. Epson blames Apple and Apple blames Epson. Any suggestions?.