Devo 12s ,,, Alierons to Flaps

Hi everyone ,,, I own a Devo 12s ,,, and I have tried everything to get the ICON light up for the Aileron to Flaps on or working
I was hoping someone on here can figure it out ... Its the only Icon i cant get to light up .... ?????
The Icon is there but it wont light up .
I am trying to make my Ailerons too work as Flaps at the same time with a basic plane setup ,, ...
Cheers Glenn