After updating Windows 10 version 20H2, you may get an error when opening the login options, or users’ MMC snap-in as Microsoft mentions in a support message regarding this issue.
After updating your system to Windows 10, version 20H2, you might receive the error in LSASS.exe with the text “Your PC will automatically restart in one minute” when interacting with any dialog window that shows users, for example accessing the sign-in options settings app page or the users’ folder in the Local user and groups MMC snap-in.
Microsoft has a workaround for this issue on hand. Read the support notice here.
Source: Microsoft Support