Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
It isn't possible to move a subscription from one account (mail) to another. I would suggest that you cancel the current subscription; see https://support.microsoft.com/en-us/office/cancel-a-microsoft-365-subscription-46e2634c-c64b-4c65-94b9-2cc9c960e91b. For more on refunds, have a look at https://support.microsoft.com/en-us/account-billing/how-to-get-a-refund-on-a-microsoft-subscription-67dca30b-b323-44d5-acc2-e02f9902c472. Then get a new subscription using the correct account.