Windows 10: Can't remove accounts used by other apps

For this problem this is a solution Add and Remove Microsoft, Work, or School Accounts used to sign in by other apps in Windows 11 Tutorial Windows 11 Forum elevenforum.com

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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:

 

Cannot remove Mail app account

Hi,

For us to provide the appropriate troubleshooting step to resolve the issue, we'd like to ask for additional details. Please answer the following:

• Have you made any recent changes or installed updates before this issue occurred?
• Are you also getting an error message when trying to remove the email account?
• What troubleshooting steps have you tried so far?

For initial troubleshooting, we suggest running the Windows App Troubleshooter.

We look forward to your response.