User Configuration > Administrative Templates > Microsoft Office 2016 > Server Settings
User
HKCU\software\policies\microsoft\office\16.0\common\internet
This policy setting controls file synchronization via SOAP over HTTP. If you enable or do not configure this policy setting, file synchronization via SOAP over HTTP is turned on. Turning file synchronization on here will still allow application-specific file synchronization to be turned off. If you disable this policy setting this policy setting, file synchronization via SOAP over HTTP is turned off. You will turn off file synchronization via SOAP over HTTP for other applications even if the application-specific file synchronization is turned on. Important: If you disable this policy setting, which will turn off file synchronization via SOAP over HTTP, you will also prevent co-authoring for Word and PowerPoint, and it will adversely affect the behavior of SharePoint Workspaces.