Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Was it purchased directly via Microsoft?
If so, if you live in the following countries, you can cancel and get a prorated refund: https://support.microsoft.com/en-us/account-billing/countries-with-prorated-refunds-for-microsoft-subscriptions-38c81df4-10c1-f3eb-8d2f-b04f980c435f
Otherwise, if you signed up within the last 30 days, you might be still qualified for refund, but you need to chat with support:
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 "Microsoft 365" > "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.
If you purchased it from a third-party seller, the refund is entirely subject to that seller’s refund policy.