Auxiliary cord doesnt work, headphones do

So i am able to listen to music via headphones, and the aux cord i have qorks with this tablet, but for some reason every other aux cord ive tried to use wont work with my tablet, but that same cord will work for them when they plug their phone into it. Its not the case cuz i tired it with the case off. Any sugestions?
I have it under warrenty so i can just replace it if need be bu tthat would be a pain so i knly want to do that as a last resort.