Hi,
What's your system version? Please run "winver" to check details.
For adding the upper kindly customer say, as I know, some versions of Windows such as Windows 10 version 2004 is not support to bypass password with netplwiz. As bypass password would bring security risk for your computer, we recommend to use Windows hello to login system with Fingerprint, Face or PIN.
For more information about Windows Hello sign-in option, please refer to: Windows 10 sign-in options and account protection
Or we could use local group policy to change the password policy with minimum password to 0 and disable Password must meet complexity requirements. So that we could use a single number as password.
For more information, please refer the link below:
Windows 10 Local Security Policy Editor
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Bests,
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