iMac does not recognized your controller

If your iMac does not recognize your controller, please check your connection with a USB-C cable.

Use a USB-C port with the "Thunderbolt" port instead. 

Please see other article below as well if your gear is the DDJ-FLX4. 

https://forums.pioneerdj.com/hc/en-us/articles/13697280077977-DDJ-FLX4-not-selectable-as-audio-device-in-rekordbox

Attached link also helps.

https://rekordbox.com/en/2023/01/important-notice-for-mac-users23/

if your issue is not solved, please contact us from here.