Aux sound through UR 22 mk2

Hey,
I would like to hear my phone (for the playalongs) through my headphones which are connected to my UR22 mk2. Is there a way to do that?
I tried connecting it with an Aux cable and an aux-ts adapter to the input 1 but nothing comes out at my DAW.
Is there a way to fix this or another way to pass my phone sound through the interface?
Thanks