Traktor A6 and S2 as internal mixer, cant hear track in headphone when pre cueing

Traktor A6 and S2 as internal mixer, cant hear track in headphone when pre cueing

Hi
my Traktor Output Rounting:

Main Left/Right >Monitor Output
“Ch A” Left/Right >Master Output

On the A6 hub
I have the following: ( back of hub)

Turntable A on the A6 Input A
Turntable B on the A6 Input B
Speaker A and B , connected to the A6 Output A
Earth wires connected to the A6 hub

I have the headphones plugged into the A6 Phone out.
I have also chosen the A6 as my sound card in the preferences,
so the problem is I cant hear the track in my headphones when I want to pre cue the track. Only time I can hear the track is when I side up the channel on my s2. Then when the sound comes out of my speaker ,then I can hear that track playing in my headphones.
I did choose the internal mix mode.
Please help.