Windows 10 allows you to sync some settings of their system with their Microsoft Account, so that they could replicate the same settings on other systems or whenever they renew or restore their operating system.
The issue is exclusive to Windows 10 as it doesn’t occur on older Windows iterations. This issue seems to only occur with Windows 10 builds that already installed the Fall Creators Update. Contact your system administrator to resolve this.’ when trying to enable sync on Windows 10. Several Windows users have been seeing the ‘Sync is not available for your account. Problems with Windows 10 Sync with Microsoft account? Here's a simple thing you can do to fix Sync is not available for your account in Windows 10.
Sync Is Not Available for Your Account Issue in Windows 10 FIX.