A family of Microsoft word processing software products for creating web, email, and print documents.
Hi Sgates3,
When you say Microsoft Office account, may I know you mean personal Microsoft account (example, Outlook.com or Hotmail.com etc.) or a work or school account?
From your description, it seems like the browser is caching the account info and it still shows your other account (let says Account B) when you open a Word document from Account A. To avoid this, I will suggest you use a different browser or open browser in iPrivate mode to access your different Microsoft accounts. Once you have opened your account in a different browser, try using @ function, see if it sill does the same thing.
Let me know if you still get the same issue.
Regards,
Neha