AndroidでGoogleアカウント連携でRelease時にエラー

AndroidでGoogleアカウント連携でRelease時(GooglePlayでリリース)にのみ「Unknown Source」エラーが出て先に進めません。
実機を接続してAndroidStudioからスマホデバイスで試験する時にはGoogleアカウント連携はできています。

以下のようなソースとなっていて、onActivityResultに返ってきた時に、エラーになって、
Log.w(TAG, "Debug: Google sign in failed", e);
が実行されています。
エラーの内容を以下につけています。原因がわからず困っています。アドバイスください。

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        ....

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                // 「ウェブ アプリケーション」の　クライアント ID
                .requestIdToken(getString(R.string.google_web_client_id)) 
                .requestEmail()
                .build();
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
    }

    // Googleボタン押下時の処理
    private void signInGoogle() {
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_GOOGLE_SIGN_IN);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_GOOGLE_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = task.getResult(ApiException.class);
                firebaseAuthWithGoogle(account);
            } catch (ApiException e) {
                // Google Sign In failed, update UI appropriately
                Log.w(TAG, "Debug: Google sign in failed", e);
                failLogin("ログイン失敗。再度実施して下さい。");
            }
        }
    }

03-05 22:21:29.078 12365-12575/? E/TokenRequestor: You have wrong OAuth2 related configurations, please check. Detailed error: UNREGISTERED_ON_API_CONSOLE

03-05 22:21:29.306 8494-8494/? W/cloudLoginActivity: Debug: Google sign in failed
                                                     com.google.android.gms.common.api.ApiException: 10: 
                                                         at com.google.android.gms.common.internal.z.a(Unknown Source)
                                                         at com.google.android.gms.auth.api.signin.a.a(Unknown Source)
                                                         at com.xxxxx.xxxxxxx.cloudLoginActivity.onActivityResult(Unknown Source)
                                                         at android.app.Activity.dispatchActivityResult(Activity.java:6597)
                                                         at android.app.ActivityThread.deliverResults(ActivityThread.java:3733)
                                                         at android.app.ActivityThread.handleSendResult(ActivityThread.java:3780)
                                                         at android.app.ActivityThread.access$1400(ActivityThread.java:165)
                                                         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1425)
                                                         at android.os.Handler.dispatchMessage(Handler.java:102)
                                                         at android.os.Looper.loop(Looper.java:150)
                                                         at android.app.ActivityThread.main(ActivityThread.java:5621)
                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

apply plugin: 'com.android.application'
check.dependsOn 'assembleMinSdkJellybeanDebugAndroidTest', 'assembleMinSdkIcsDebugAndroidTest'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"
    flavorDimensions "minSdkVersion"
    defaultConfig {
        applicationId "com.xxx.xxx"
        minSdkVersion 14
        targetSdkVersion 26
        versionCode 17
        versionName "1.5.13"
        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    lintOptions {
        abortOnError false
    }
    productFlavors {
        // Build variant with minSdk 14, excludes Facebook and FirebaseUI libraries.
        minSdkIcs {
            dimension "minSdkVersion"
            minSdkVersion 15
        }

    }
}

dependencies {
    //noinspection GradleCompatible
    compile 'com.android.support:appcompat-v7:26.1.0'
    compile 'com.android.support:animated-vector-drawable:26.1.0'
    compile 'com.android.support:design:26.1.0'
    compile 'com.android.support:cardview-v7:26.1.0'
    compile 'com.google.firebase:firebase-auth:11.8.0'
    compile 'com.google.android.gms:play-services-auth:11.8.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test:runner:0.5'
    compile 'com.facebook.android:facebook-android-sdk:[4,5)'
    compile('com.twitter.sdk.android:twitter-core:3.0.0@aar') {
        transitive = true
    }
    compile('com.twitter.sdk.android:twitter:3.1.1@aar') {
        transitive = true
    }
    // For MPAndroidChart
    implementation 'com.github.PhilJay:MPAndroidChart:v3.0.3'
}

// ADD THIS AT THE BOTTOM
apply plugin: 'com.google.gms.google-services'