Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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The steps to cancel the Microsoft 365 subscription are provided on this link, and while managing the subscription, ensure you disable the recurring billing on the subscription to avoid any further payments.
You should then be entitled to a pro-rata refund, you can check your eligibility to a refund using the steps on this link.
If you paid for the subscription on the Apply App Store, you will need to contact Apple Support on this link: https://support.apple.com/118428