Aux piece stopped working

Aux stoped working randomly. I make music with a aux to lighting piece connected to some headphones. I was using the aux about 3 days to a week before I tried to use them again and it’s not working now. It plays music through the headphones I use and it normally would play through the aux even if the headphones aren’t workin so ik it’s not the headphones. I bought and tried different aux cords and nun of them worked. I plan to try new headphones but I really don’t think it’s the headphones. I even tried a new aux cord and the same result, it plays out my phone instead of the aux.