Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I have been struggling with this issue for the past year also. Finally my credit card expired and I had to deal with it. Start over with a new subscription and sign up for the Business Assist ($5 per month extra, but you can cancel as soon as you get it resolved). Once your new account is setup, Business Assist can migrate your old and new account together and you are back in business. It's a dumb solution, I know, but it is the only way to solve it unfortunately!