Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi,
Please note that here in the Microsoft Q&A forum, we are fellow users and do not have account access.
Unfortunately, Microsoft 365 subscriptions can only be cancelled by signing in to the Microsoft account where the subscription was created.
If the store set it up for you and you don’t have the email password, you won’t be able to cancel it yourself.
Even if you contact Microsoft Support, they cannot directly cancel the subscription without you first passing full account verification and gaining access to the account. Without that, they are also limited.
Your best next step is to contact the store where the computer was purchased and ask them to remove or cancel the subscription they set up. You should also contact your bank or card provider to stop the recurring charges while this is being resolved.