A family of Microsoft word processing software products for creating web, email, and print documents.
The administration of Office for Business is unreasonably complex for individual users. Once you sign in to the Microsoft 365 Admin Center, choose Copilot, then Settings, then choose Allow Copilot access for your user, then click on Review, then choose Block app, then check the box Yes, I'm sure I want to block the app.
FWIW, Microsoft 365 for Business assumes you have an I.T. department. The Personal/Family edition is simpler to administer, is less expensive and probably has all the Office features you need.