Windows 10: I have a Microsoft account logged into two devices. Are my files safe if I remove the...

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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:

 

Unknown devices on my Microsoft account

Hello Flemmingk,

Could these other devices be from friends that you may have signed in to your Microsoft account on for something?

Either way, you can remove these devices.

*Arrow Microsoft Account - Remove Devices User Accounts Tutorials

Afterwards to be safe, I would recommend to change the password of your Microsoft account, and enable two-step verification if you haven't already.

Change Password of Account in Windows 10 User Accounts Tutorials

Turn On or Off Microsoft Account Two-step Verification User Accounts Tutorials

 

Cannot remove devices from Microsoft account

Hi Shelley, thanks for your question. I'm Graeme, a Microsoft Community expert and fellow user.

You'll need to get your son to log into his Microsoft account to remove the device. Here are the steps:

- Log into the Microsoft Account associated with the device at account.microsoft.com

- Click View Account, then Devices.

- You'll see a list of associated devices. You can select and remove devices here.

Hopefully this is the solution you're after. If it doesn't work, please let me know and I'll see what else we can try! Thanks!