Active network management (ANM) is a promising approach to cope with the proliferation of distributed generation from renewables. The distribution system operator (DSO) can utilize its own assets in this regard, e.g. by installing remotely controllable on load tap changer transformers. Additionally, the DSO can incorporate distributed energy resources from third parties into its active network management. This, however, involves specific challenges such as dealing with temporary unavailabilities of these systems and ensuring a smooth transition between autonomous control and control by the DSO. This contribution presents an extended ANM control algorithm that addresses these challenges.