What causes "please check whether the agconnect-services.json file is added to your app project" in using HMS Map Kit with React Native

I already added the agconnect-services.json file and already succeeded in integrating HMS Push Kit in getting AAID and device token

Found it. I added apply plugin: 'com.huawei.agconnect' in /android/app/build.gradle under apply plugin: "com.android.application"