Windows 10 Troubleshooting: Work Folders setup or sync failure due to password policy
Introduction
In Windows 10, EAS engine is the component enforces the password policy for Work Folders.
Issue
EAS has a change, which results the user is unable to change password if any of the user account on the device is unable to change password.
Resolution
In short, when you see this failure on the client, make sure all users(including local user accounts) on that device can make change to the password.
More info
You can find more details on this MailApp documentation, which uses the same EAS engine for the password policy enforcement.