Go here to AMD website concerning how to get the code for your game: https://www.amdrewards.com/amdrewards/
From the link above concerning the TERMS & CONDITIONS for getting the code: https://www.amdrewards.com/amdrewards/files/AMD-Rewards-Quake-Champions-Ryzen7-5-SI.pdf
From the PDF Link:
Campaign Period: Campaign Period begins August 22, 2017 and ends on February 15, 2018 or when supply of Key Codes is exhausted, whichever occurs first.
Eligible AMD Product or qualifying System Integrator system containing an Eligible AMD Product must be purchased during Campaign Period.
Redemption Period: The AMD Unique ID must be redeemed within two (2) months of the end of the Campaign Period or April 15, 2018 to obtain Application downloads after which the AMD Unique ID is void.
PLEASE BE ADVISED – NOT ALL RETAILERS OR E-TAILERS ARE PARTICIPATING IN THIS PROMOTION FOR ALL PRODUCTS. BEFORE YOU PURCHASE A PRODUCT PLEASE VERIFY THAT THE RETAILER HAS CHOSEN TO PARTICIPATE FOR YOUR DESIRED PRODUCT.