No matching client found for package name (Google Analytics) - multiple productFlavors & buildTypes

Check your package name on your google-services.json it should be same with your local package name of your app

Example

"client_info": {
    "mobilesdk_app_id": "1:6596814400689:android:65d6f25f5006145",
    "android_client_info": {
      "package_name": "com.my.app.package.name"
    }

In this case my local package name is com.my.app.package.name so also i have changed my package name in google-services.json with my local package name

Found this:

The google-services.json file is generally placed in the app/ directory, but as of version 2.0.0-alpha3 of the plugin support was added for build types, which would make the following directory structure valid:

app/src/
    main/google-services.json
    dogfood/google-services.json
    mytype1/google-services.json
    ...

Source

Source 2