Java – E/FirebaseInstanceId : Token retrieval failed: AUTHENTICATION_FAILED Android studio

Well, there’s a bit of madness here. Every time I launch my app in android studio, I get this error before processing any code:

E/FirebaseInstanceId: Token retrieval failed: AUTHENTICATION_FAILED

To apply Gradle:

Application plugin: ‘com.android.application’

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "fraternityandroid.greeklife"
        minSdkVersion 22
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.google.firebase:firebase-database:11.6.2'
implementation 'com.google.firebase:firebase-auth:11.6.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-

core:3.0.1'
    implementation 'com.google.android.gms:play-services:11.6.2' //11.7.43 //could do 11.6.2 all around
}


apply plugin: 'com.google.gms.google-services'

Project Gradle:

Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.0.0'


    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
    classpath 'com.google.gms:google-services:3.1.0'
}
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Code:

    public void validateExists() {
    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference("Users");

    myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot snapshot) {
            for (DataSnapshot postSnapshot: snapshot.getChildren()) {
                Map<String, Object> post = (HashMap<String, Object>) postSnapshot.getValue();
                for (Map.Entry<String, Object> entry : post.entrySet()) {
                    if (mEmail.getText().toString().equals(entry.getValue())) {
                        System.out.println("found it!!!");
                        authenticate();
                        return;
                    }
                    System.out.println("Didnt find it!!!");
                }
            }
        }

        @Override
        public void onCancelled(DatabaseError error) {
            System.out.println("Errorrrr it!!!");

            //log error
        }
    });
}

I just wanted to run some damn firebase calls. I’m running 11.7.2 on the Play Store on the emulator (API 26).

Please help PPPP
Thank you
`

Actually, when I started using LAN with a proxy, it started working perfectly when I changed to wifi: So I guess it’s a communication issue: But my advice is to use your android phone instead of an emulator.