ATT Fiber Internet NVIDIA GeForce Now Ultimate 6 Month Code Expired Before Redemption and Stated Deadline

I recently claimed my offer for the NVIDIA GeForce Now Ultimate 6 Month Code after becoming an ATT Fiber Internet customer, however when trying to redeem it in the provided webpage, it stated that it had expired. The email I received with the code said I was able to redeem this code without issue until 6/23/2023, but I am having issues trying to redeem it on 6/3/2023. This doesn't make sense as I should still have ample time to redeem the code. May I get some assistance in solving this issue and obtaining a new code that can be redeemed successfully?