Hello,
If the refund request option is not appearing in the order history via your account https://account.live.com > order history, you need to contact support, explain to them, and they typically can manually process it for you. That happened to me before with items that is not considered refundable.
To get help, open the "Get Help" app on your computer (just search for it in the Start menu). or go to https://support.microsoft.com/contactus, Type "Billing" and press Enter. On the next screen, click "Contact support" at the bottom of the page, then choose "Windows" > "Manage my subscription". You’ll then see the option to chat with a Microsoft support agent who has access to your account to help review the issue.