Connect the DDJ-T1 directly to a USB port (avoid unpowered USB hubs).
Are you trying to connect this to a or a particular DJ software like Traktor Pro 3? DJM-T1 Driver - MacOS Big Sur 11.0.1 - Pioneer DJ forums
He was wrong.
Rekordbox 5 and 6 do not natively support the DDJ T1. You would need to use a or third-party mapping—results vary.