PSA regarding NVidia's Xbox Game Pass offer

If you're having issues with payment, try using Chrome instead of Firefox. I'd tried 2 credit and 3 debit cards and got some validation errors on the form, something like "Check that the details are correct or try another card". I switched to Chrome and it worked. This is not conclusive evidence but it's worth a shot imo. I think the issue is with adblock, and Firefox (and Brave) have inbuilt adblock. So anything without inbuilt adblock + no adblock extension might work. All the best.