If you have enabled windows 10's built-in administrator account, and upgrade from build 1803 to 1809 -- that is, the April 2018 Update to the October 2018 update -- you will find that a bug has been introduced that disables the account.
Microsoft says that it is aware of the problem, but the company does not plan on releasing a fix for it until the end of the month.See also: Windows 10 finally overtakes Windows 7 Windows 10 bug could allow files to be overwritten, researcher shows Latest Windows 10 preview build is an early Christmas present for Insiders, with Windows Sandbox and other treats Microsoft announces Windows Sandbox, a desktop environment for running applications in isolation
The issue has been noticed by users, and has also been highlighted by Microsoft's Japanese team in a post on TechNet . The post points out that in order for the problem to appear, two conditions need to be met. Firstly, the built-in administrator account must be activated, and secondly that there must be another account with administrator privileges.
The post goes onto say (Japanese-to-English translation via Google Translate):We are currently working on solving this problem, and at the moment we aim to release a patch in late January 2019. Therefore, if you need to upgrade before the patch is released, please confirm that you can surely sign in with a user with administrative privileges other than the built-in administrator, before you upgrade Please do it. Also, if you have already upgraded and you have invalidated the built-in Administrator, you are signed in as a user with administrator privileges other than the built-in Administrator, activate the built-in Administrator.
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