Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
Please sign in to the following link using your Microsoft account:
https://account.microsoft.com/services/microsoft365
Locate your subscription and select "Manage". Then proceed with the refund.
For more details, please refer to:https://support.microsoft.com/account-billing/%E5%A6%82%E4%BD%95%E8%8E%B7%E5%BE%97-microsoft-%E8%AE%A2%E9%98%85%E7%9A%84%E9%80%80%E6%AC%BE-67dca30b-b323-44d5-acc2-e02f9902c472