Flutter - gives not found instead of redirecting to app

when I log in to the app, it works, but it won’t return back to the app automatically and returns a not found page, how can I fix this
here’s my build.gradle:

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 33

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

    kotlinOptions {
        jvmTarget = '1.8'

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.auth0.flutterapp"
        minSdkVersion 23
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        manifestPlaceholders += [auth0Domain: "my_auth0_domain", auth0Scheme: "https", 'appAuthRedirectScheme': 'com.auth0.flutterapp']
        // <---

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug

flutter {
    source '../..'

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

Hey there @ableflyer welcome to the community!

Most users end up using a custom auth0scheme as opposed to https - For example, if I were to set auth0scheme: "demo" and add the callback url demo://mydomain.us.auth0.com/android/com.auth0.androidsample/callback to my application settings in my Auth0 dashboard.

Some more on using https (and Android App Links) here:

Hope this helps!

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