官方解决办法： Another account is already signed in computer when signing in to Office 2013 - Office | Microsoft Docs
https://blog.haitianhome.com/onedrive-office-huancun-pingju.html 2.（这一步可能不需要）按照这个英文的链接方法删除凭据和注册表，并重新在 Office 里登录。
https://blog.csdn.net/WarmSunshine7/article/details/88387074 经过排查主要是user因为security policy提示更改了登陆密码，但是Windows Credentials manager中的认证没有及时更新导致认证错误。
Download the Microsoft Support and Recovery Wizard.
Install the application on your computer and launch it.
Select Office and click Next.
Follow the instructions on the screen.
Reinstall Office using a simple repair tool to completely remove it from your PC. When you exit Office, it is not automatically uninstalled.
First, log in with a Microsoft account.
Select Install Office.
Select Startup/Setup/Save File, depending on the browser you are using.
You should see that you’re ready! The office is now installed when you’re done.
Office 365 Account Error – we can’t get to your account right now – Strong I.T. Guy (strongitguy.com)
A temporary fix was to reset the TPM in windows:
-> Start menu search
-> type and click on "Windows Defender settings"
-> click Device Security
-> click security processing details
-> click security processor troubleshooting
-> click clear TPM