Unable to redeem the discounted Universal Orlando tickets available to Xfinity Rewards members

Hi, I've been unable to redeem the xfinity reward offer for discounted Universal Orlando theme park tickets. I've claimed it in my Xfinity Membership account (gold level, started service 11 months ago), but when I follow the link from my offers to the page (https://www.universalorlando.com/web-store/en/us/xfinity/special-offers) I initially see the discounted price but when I add the tickets to my cart the price jumps up way above the initial promo price. It seems there is some sort of technical issue on the site? Can I please have help redeeming the offer for discounted tickets? Thanks