The site is experiencing numerous issues with shipping labels, display of payments info, and log-in issues. I tagged eBay reps for assistance on this thread:
https://community.ebay.com/t5/Report-eBay-Technical-Issues/No-Services-Available-on-the-Ship-Your-Or...
I'd give that time to resolve and try again afterwards just in case your coupon issue is tied to the other site issues. If you're still having problems with setting up promotions after the site issues are fixed, come back and let us know.
