FirebaseCrashlytics: Settings request failed

I almost finished building my android app, but I want to add FirebaseCrashlytics. I always add this and I never had a problem installing it. But now its diffrent. I get the following error:

2021-05-24 20:41:42.807 11296-11333/com.example.depeuleschil E/FirebaseCrashlytics: Settings request failed.
java.io.FileNotFoundException: https://firebase-settings.crashlytics.com/spi/v2/platforms/android/gmp/1:966637647957:android:9f830999a842bf19b5fcdc/settings?instance=864af142db1afeaf05a53d2c5a0bee2a10c2f546&build_version=1&display_version=1.0&source=1
    at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:255)
    at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:211)
    at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:30)
    at com.google.firebase.crashlytics.internal.network.HttpGetRequest.execute(HttpGetRequest.java:80)
    at com.google.firebase.crashlytics.internal.settings.network.DefaultSettingsSpiCall.invoke(DefaultSettingsSpiCall.java:113)
    at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(SettingsController.java:199)
    at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(SettingsController.java:192)
    at com.google.android.gms.tasks.zzp.run(Unknown Source:2)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at com.google.firebase.crashlytics.internal.common.ExecutorUtils$1$1.onRun(ExecutorUtils.java:64)
    at com.google.firebase.crashlytics.internal.common.BackgroundPriorityRunnable.run(BackgroundPriorityRunnable.java:27)
    at java.lang.Thread.run(Thread.java:923)

I have spent 2 hours on google already and on Stackoverflow there are some people that encounter the same sort of problem. But the problem is always slightly different and I have literally tried every suggesting that I could find on Stackoverflow, but nothing works.

This is the documentation I use: https://firebase.google.com/docs/crashlytics/get-started?platform=android

I have deleted and cleared the firebase app online and tried to reinstall (3 times) but nothing works. I hope someone can help me with this problem.

This is my gradle file (app level)

plugins {
id 'com.example.test'
id 'kotlin-android'
id 'kotlin-kapt'
id 'com.google.gms.google-services'
id 'com.google.firebase.crashlytics'
}

android {
compileSdkVersion 30
buildToolsVersion "30.0.3"

defaultConfig {
    applicationId "com.example.test"
    minSdkVersion 16
    targetSdkVersion 30
    versionCode 1
    versionName "1.0"
    //for support vector images in an imageview
    vectorDrawables.useSupportLibrary = true


    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
    jvmTarget = '1.8'
}
buildFeatures {
    viewBinding true
}
}

dependencies {

implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.5.0'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.3.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation 'com.google.android.material:material:1.3.0'
implementation 'androidx.recyclerview:recyclerview:1.2.0'
// cardView library
implementation 'androidx.cardview:cardview:1.0.0'
// Viewpager2
implementation 'androidx.viewpager2:viewpager2:1.0.0'
//tablayout
implementation 'com.google.android.material:material:1.4.0-beta01'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.synnapps:carouselview:0.1.5'
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.5'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.5'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

// firebase
implementation platform('com.google.firebase:firebase-bom:28.0.1')
implementation 'com.google.firebase:firebase-crashlytics-ktx'
implementation 'com.google.firebase:firebase-analytics-ktx'
 }

and this is my build.gradle (package level)

buildscript {
ext.kotlin_version = "1.4.32"
repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:4.2.1'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
    classpath 'com.google.gms:google-services:4.3.8'
    classpath 'com.google.firebase:firebase-crashlytics-gradle:2.6.1'
}
}
allprojects {
    repositories {
         google()
         jcenter()
     }
  }

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

I faced a similar error. After looking at several potential solutions and even workarounds, I inspected the URL from which the settings were being attempted to be fetched. I found that my App Id was set to an old id.

Use the latest google-services.json file from your Firebase console (add it to your project).

P.S.: Do check your other related Google/Firebase tools and services after updating google-services.json in your app. This little issue was also blocking my Firebase events.

P.P.S.: +1 to @Gerardo's answer above.