Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi,
If you have two Microsoft 365 accounts, first identify which account has the subscription you want to keep. Then sign in to the account you want to cancel and go to: https://account.microsoft.com/services
Select the Microsoft 365 subscription and choose Manage > Cancel subscription.
Cancelling the subscription will stop future billing, but it does not normally delete the Microsoft account itself. You can continue using the account after the subscription ends, although Microsoft 365 premium features and storage benefits will be removed.
If you have saved more files in OneDrive than the free storage limit allows, make sure to move or download your files before the subscription expires. Otherwise, you may no longer be able to upload or edit files until you reduce your storage usage.