If you’re trying to get your working on a newer Mac (macOS 11 Big Sur or later), you’ve likely hit a wall. Official driver support ended years ago – the last official driver from Pioneer was for macOS 10.13 High Sierra.
If your Mac doesn't see the controller, or if Traktor shows no output: Pioneer Ddj T1 Driver Mac Download
section and download the latest available version (typically labeled for macOS 10.x versions). Important: If you’re trying to get your working on