It does not work on the phone

Hello I am new here, and I have a problem.

I am integrating UnityADS, and I pc works fine even connect the phone via the Remote Unit, but when I generate the apk and install on your phone, not working.
Want ads shown even more pressing the button to exit the game, and after the end of the game show the video display.
As I say the PC works well as it is easy to implement, but with the apk, no.
Can someone help me out?.
Thank you.
Sorry if my English is not good.