Trying to Delete from Settings -> Email and Accounts
I was trying to “fix a problem with one of my accounts” in Windows when I realized that it was an old work account that was complaining. The problem is that “Email and Accounts” in Windows 10 only provides a “Manage” option, which requires login:
The answer: Settings -> Access work or school
This is a pretty simple one but I eventually found the answer here. By going to Settings -> Access work or school, you can [Disconnect]:
Click on the account that you want to disconnect:
Click [Disconnect]:
After clicking [Yes], Windows will churn for a bit and then you should be all done: