A high availability (HA) Identity Bridge (IDBridge) between an on-premises Active Directory (AD) and a cloud-based Identity Cloud Service (IDCS) is provided. A connection to an AD, coupled to a first network, is established. A connection to an IDCS, coupled to a second network, is established, the IDCS including a System for Cross-domain Identity Management (SCIM) directory. A plurality of selectable AD OUs are displayed in a GUI, and a selection of one or more OUs is then received. Each member group of the selected OUs is displayed in the GUI, and a selection of one or more member groups of the selected OUs is then received. The users of the selected OUs and the selected member groups of the selected OUs are monitored to identify users and groups that have been added, modified or deleted. The identified users and groups are then synchronized to the SCIM directory.