If you read the T & C, https://www.amdrewards.com/terms and followed the instructions, you then need to use the Support form on that site for further help if there is an issue.
My PC- 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.