应用不显示广告，可能是广告sdk 依赖项没有注册
dependencies {
implementation fileTree(dir: 'bin', include: ['*.jar'])
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.google.android.gms:play-services-ads:11.0.4'
}
另外可以在adb 的logcat里面看到错误信息
具体接入流程可以找下面地址查看
https://developers.google.com/admob/unity/start?hl=zh-cn