D&MCS uses Basic authentication so connect to SharePoint -On-premise installations
To connect the D&MCS to a SharePoint on Premise installation you will have to:
Make sure the D&MCS have access to the SharePoint On-Premise server. If access the SharePoint server is restricted to the internal Organisations domina and you are not using a On-Premise D&MCS make sure to set up a VPN connection between the D&MCS and the SharePoint server. To do this please refer to this article.