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I understand that you are trying to cancel your subscription but are unable to access the admin account. As you mentioned that you are the only user associated with this business, I understand how important it is to regain access to manage your subscription.
As a first step, please try signing in using an InPrivate/Incognito window or a different web browser to determine whether the issue is related to cached credentials or browser settings.
If you are still unable to access the account due to MFA issues, or if you are repeatedly redirected to a personal account instead of the admin account, I recommend contacting Microsoft Support for further assistance. They can investigate the account status and review the exact sign-in behavior with you directly.
Please refer to the following Microsoft article to find the appropriate support phone number for your region and contact the frontline support team, who can create a support ticket on your behalf:
Customer Service Phone Numbers - Microsoft Support
Please feel free to let me know if there are any updates or if you have any further questions. I'll be happy to assist further.