Windows 10: How to delink personal account from 365 account

I bought a new computer to use for my small business and bought a new Microsoft 365 business package. I signed into copilot on my new computer with my personal email account and now my files from my personal account are showing up on my business account and my personal account is auto logging in. Can I deactivate the new business account and start over or unlink the personal account? I don’t want my business account to have access to my personal account.

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Delinking Microsoft account from bulit in administrator account

Hi, I'm sorry I was using a Chinese version of windows 10 at work, so could not find much information about what I need.
My personal microsoft account somehow got linked to the windows 10 administrator account. If I create another administrator account and try to delete the original administrator account, it doesnt let me do it. I just want to delink my ms account from the computer.
Anyone has any clues?

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code:

 

How to delink a microsoft account from the default administrator

A while ago I got tired of microsoft sending me pings about linking my account, so I logged in with a random account and linked the default admin to it. Now I want to delink it because microsoft store sucks and wont let me log in due to it being a "Personal
Acc.". How do I delink the admin account from the microsoft account. (And I dont want to delete the account because it'd be a hastle to resetup everything)