Hi Librarian,
DT168 currently supports DDM when connected to a dLive, Avantis, SQ mixer or AHM-64.
Note however that the DT Preamp Control app does not support DDM at this stage.
If you are having trouble getting the DT168 working in a Dante domain, please open a Support ticket with us at support.allen-heath.com with info on your setup, DDM configuration, and please confirm firmware versions of both the DT168s (both the control firmware as reported in the DT Preamp Control app, and the Dante firmware as reported in Dante Controller), and your Dante card (both the control firmware as reported in the dLive GUI, and the Dante firmware as reported in Dante Controller).