THROUGH output from the turntable/CDJ connected with my INTERFACE 2 does not output from the INTERFACE 2.

Follow the instructions below depending on your rekordbox status:
- PERFORMANCE mode (DVS enabled)
Select [THR] (THROUGH mode) for DVS mode for each deck.
- PERFORMANCE mode (DVS disabled) or Export mode
Reset the setting utility for THROUGH mode.
Go to [ROUTING] tab → [Output Routing] and select [THRU] (not [USB]).