Education verified but yearly Professional plan is not 0 USD

Hi,
I verified my education status and Dify shows that an education coupon has been assigned to my account.
However, when I go to Settings → Billing and try to upgrade to the yearly Professional plan, the total price is still not 0.
I’m a student and using a university email / GitHub Education account.
Could you please check my account and apply the Education coupon correctly to the yearly Professional plan?
I can provide more details via DM if needed.