Hi @corsonr,
I have a similar issue. I had Coupons as a separate menu item, but that is no longer available. I have learned through a search that this should now be under the Marketing Hub. However, I do not have the Marketing Hub even though I’m running Version 4.8. I have also followed these instructions and have the right enable coupons box clicked: https://docs.woocommerce.com/document/coupon-management/
I have also done a conflict test only with recently added or updated plugins.
I’m not skilled with code but I can follow directions. Where and how should I look for the code you mention above?
Thanks, Kacee