Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Please note that you are not communicating with Microsoft here. Q&A is a user-to-user forum (hosted by Microsoft). Contributors in the forum do not have access to user accounts or billing information.
Since you have a business subscription, you should be able to get in touch with the Data Protection Team at Microsoft business support. See https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide .
The fact that you have lost access to the account makes things more complicated. It has been suggested in the forum that the process will be a bit quicker if you set up a new trial business subscription, just to get access.