Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Are you switching from Microsoft 365 Family to Microsoft 365 Personal? In that case, you will have to wait for the Family subscription to expire before you can access 365 Personal, I believe.
P.S. Please note that you are not communicating with Microsoft here. Q&A contributors are your fellow users and we do not have access to user accounts.