The WooCommerce Coupon management page has moved to Marketing > Coupons:
Link to image: https://d.pr/i/s36DIC
Please check there to see if it is available.
You could also try browsing directly to the URL: https://yourdomain.com/wp-admin/edit.php?post_type=shop_coupon
to see if the page is available.
If you are still having trouble, please share a copy of your site’s System Status. You can find it via WooCommerce > Status. Select “Get system report” and then “Copy for support”. Once you’ve done that, you can paste it here in your reply. Please note that since this is a public forum, you may want to remove any sensitive information that you don’t want shared publicly.
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