User Configuration > Administrative Templates > Microsoft Word 2016 > Miscellaneous > Server Settings
User
HKCU\software\policies\microsoft\office\16.0\common\internet
This policy setting controls file synchronization via SOAP over HTTP for Word. If you enable this policy setting, file synchronization via SOAP over HTTP is turned off for Word. If you disable or do not configure this policy setting this policy setting, file synchronization via SOAP over HTTP is turned on for Word. Note: Turning off file synchronization via SOAP over HTTP will also prevent co-authoring and adversely affect the behavior of SharePoint Workspaces.