In Dynamics On Prem we currently cannot change the SSSForceFilteringMethodForUserMailboxes parameter in order to force the parameter to users. When we try to change it via an update of dborgsetting or the solution OrganizationSettingsEditor, it doesn't work as it says that the datatype is not valid (There was an error updating your orgDBOrgSettings: Invalid Organization Setting passed in: SSSForceFilteringMethodForUserMailboxes. Please check the datatype and pass in an appropriate value.)

It would be great to be able to change this parameter.