Hello, Master!
We apologize for any inconvenience caused by the coupon redeeming issue. At present, the coupon redeeming option is only available on Android devices. We are aware of the issue and are working on implementing additional ways for coupon redemption to enhance your gaming experience.
Rest assured, we are actively searching for a solution and will keep you updated as soon as we have any news on this front.
Thank you for your patience, understanding, and continuous support.