Sync your settings is deactivated on Win10
This feature is available free with Microsoft Account sync. However as soon you enable O365 Azure AD the device registers or joins Azure AD if you add email, OneDrive, etc. disabling Microsoft Account sync but not providing an alternative unless an Azure AD P1 or better license is purchased. The feature in AD is called Enterprise State Roaming. The feature should be included in Azure AD or the ability to disable it so Microsoft Account sync can be used.
It seems unfair to remove a free function when you sign up for a paid service (O365).