Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello @Michael Watson
Based on the information you provided, it appears that you are experiencing difficulties canceling the Microsoft 365 Business Basic subscription.
To proceed with the cancellation, please sign in to the Your products - Microsoft 365 admin center using the Global Administrator account or the account that was used to purchase the license or start the business. Once logged in, you will be navigated to Your products page and check whether your billing account type is MOSA or MCA.
1/ If the account type is MOSA:
Please select the subscription and choose Cancel subscription.
2/ If the account type is MCA:
Kindly contact the Microsoft Support Billing Team directly. They will be able to assist you in cancelling the subscription from the back-end.
To create a support ticket, please follow the instructions provided in the following article: Get support - Microsoft 365 admin | Microsoft Learn
When opening the support request, please make sure to disable the Support Assistant (AI) in the Help panel first. After that, enter a brief description of the issue. Once the AI assistant is turned off, the Contact Support option should become available, allowing you to submit a support ticket directly to Microsoft's support team.
Please give a try and let me know if you have any further concerns.