Test Mode ads not showing on the device

Hello,
I try to use Unity Ads.
However it shows well in editor, but when it build it and run on device, banner doesn’t
show with a log below

06-17 19:44:48.545 3695-3864/? I/UnityAds: com.unity3d.services.core.api.Sdk.logInfo() (line:69) :: TestMode delegate is set
06-17 19:44:48.569 3695-3864/? I/UnityAds: com.unity3d.services.core.api.Sdk.logInfo() (line:69) :: Requesting ad plan from https://auction.unityads.unity3d.com/v4/test/games/3188763/requests?advertisingTrackingId=94de38a1-3daa-4d04-80c5-0f58ae13f933&limitAdTracking=false&deviceModel=SM-N960N&platform=android&sdkVersion=3100&stores=google&deviceMake=samsung&screenSize=268435810&screenDensity=420&apiLevel=28&test=true&screenWidth=1080&screenHeight=2094&connectionType=wifi&networkType=13
06-17 19:44:50.158 3695-3864/? I/UnityAds: com.unity3d.services.core.api.Sdk.logInfo() (line:69) :: AdPlan received with 1 campaigns and refreshDelay 0

I set test mode true, using 2019.1.0f2 version of unity editor.
And i import unity Monetization 3.1.0

Anyone can solve this problem?

I fixed it sorry.

Can you say how? I’m having a similar problem.