how to redeem advanced exam voucher after redeemed core exam voucher?

on the solidworks subscription services page ( https://www.solidworks.com/how-to-buy/subscription-services ) it says "The Certified SOLIDWORKS Professional and Certified SOLIDWORKS Associate exams are available to Subscription Services members. Build your team’s skills with two free core exams and two advanced exams per year for every seat of SOLIDWORKS you purchase." but i was only able to redeem 1 core exam, how can i redeem the advanced exam voucher within the first half of the year ?