Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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You can use the AI answer to cancel.
Typically within 30 days, especially if this is made by mistake, even if you cannot be qualified for prorated refund, you can still contact billing support to ask for a refund so you can correct your order.
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.