FYI, I was able to use my upgrade coupons, so it’s first class for me!
I thought the same thing so I called AGR and the agent said that paying the fare with a discount doesn’t apply and it’s only meant for the actual upgrade itself. I can’t upgrade until 12 hours before departure. Hope that’s true, I will find out soon enough.
I can't remember off the top of my head if you are allowed to use the Coupons with a Discount code. I don't think you can. But I didn't learn that much about coupon use.
Congrats! The more you drink the more you get your moneys worth.