Don't understand why you would contact Sapphire, only a participating retailer could supply the coupon code.
And it is too late now, the claim period has ended.
Terms & Conditions https://www.amdrewards.com/terms
Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T..