You can do two things that may work depending on how much access you have... you can go in settings and check credit card billing address, that would be the address most likely due to it have to have zip verification matching the card placing the orders.... second is just change the zip......third is do not use the account zip code.....download PocketZee App or Gyft App and add the reward code manually then let the scan the reward code directly...
Hopefully this helps you.... Work for sams club - walmart accounts also