It appears that the list of errors in Windows 10 version 1809, the update in October 2018, is still growing despite Microsoft's efforts to fix these errors.
Microsoft's Japanese Ask Network and AD support team confirmed another error in Windows 10 version 1809; The error may occur when devices running Windows 10 version 1803, the update in April 2018, are upgraded to Windows 10 version 1809.
According to the report, the embedded Windows 10 administrator account may become invalid during the upgrade. In other words, it cannot be used anymore because it is damaged after the upgrade.
The error occurs when the following two conditions are met:
- The built-in administrator account is enabled (it is disabled by default).
- There is at least one additional account with administrator rights.
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Administrators are asked to ensure that at least one additional administrator account is available on devices before the upgrade to the new version of Windows 10 is started.
You can do the following to determine if another administrator account is available on a device:
- Use Windows-R to open the drive box on the system.
- Type control user password . (See our full list of shortcuts on the multi-shortcut control panel)
- Select "Manage another account".
Windows 10 displays the list of accounts on the device and their type. If the administrator is listed next to an account, there is an elevated account.
Windows 10 version 1809 is one of the buggy feature upgrades for Windows 10 that Microsoft released since the launch of the Windows 10 operating system in 2015.  Confirmed errors contained data loss issues, audio playback issues, and bluescreens, writing problems, issues with mapped network drives that do not connect properly and much more.
Microsoft had to stop the distribution of the upgrade in October 2018 days after it activated the distribution. It took the company until December to fix major errors and start the operating system redirection. The rollout has gained momentum since then, and the revelation of the new error will not change it as it – likely – will not affect many devices.
Nevertheless, with just three months to go to the next feature upgrade is released, Microsoft needs to find a way to solve all outstanding issues and do something against an increasing number of reviews reached in the company's patch and release plans.