Image Method: Distributed unavailable

Four machines all synced and running exactly the same config., all in the same pool and visible as nodes. When starting a job, selecting Job Type: Render, Render Mode: Image, and Image Method: Single is the only available option. Starting the job with all 4 nodes in the available pool and “searching for task”, the job only renders on one machine. We are unable to select “Distributed” as an Image Method. What are we doing wrong?

Which render engine are you using? Currently Distributed rendering is only available for V-Ray.