first, I hope I understand because I can not speak English well. I am using Unity. Unity version is 5.6.1f1. Admob version and Adcolony version is latest.
Originally, Using Admob + Unity Ads mediation. At this time, admob banner load and show successfull.
after, i'm add the AdColoy. but, admob banner load fail. so, Test the admob test banner, result is load succeeded.
I do not know why the banner failed ad requests. adUnitId is no problem.
Please help me if you have any experience with this or if you know the solution.