can't check out on wynncraft store

I want to claim my free crates from the store but whenever I click the complete order button, it gives me this error:

https://preview.redd.it/plvzblj1djuf1.png?width=508&format=png&auto=webp&s=f8b433b5d90dabf36e7c1c849fd18081272aa335

(I did check the privacy policy box)