Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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To cancel the Office 365 Subscription, go to https://account.microsoft.com/services Services & Subscriptions page and sign in with your Microsoft account.
Locate your Office 365 Subscription, click Manage > then select Cancel Subscription.
Once cancelled, you will receive an email confirmation that the subscription has been successfully cancelled and that the refund has been initiated.
You can go to the Microsoft order history page to check the status of your Microsoft Store return.
https://account.microsoft.com/billing/orders
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You will then receive the refund amount to the original payment method within 3-5 working days.