Flutter Firebase Phone authentication not working

[Hemant-Gurjar]

Launching lib\main.dart on Lenovo TB X304L in debug mode...
Running Gradle task 'assembleDebug'...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Waiting for Lenovo TB X304L to report its views...
Debug service listening on ws://127.0.0.1:52398/z_Smci63gS4=/ws
Syncing files to device Lenovo TB X304L...
E/zzf (12820): Problem retrieving SafetyNet Token: 7:
W/Adreno-EGL(12820): <qeglDrvAPI_eglGetConfigAttrib:612>: EGL_BAD_ATTRIBUTE
D/vndksupport(12820): Loading /vendor/lib64/hw/gralloc.msm8937.so from current namespace instead of sphal namespace.
I/DpmTcmClient(12820): RegisterTcmMonitor from: com.android.okhttp.TcmIdleTimerMonitor
I/DpmTcmClient(12820): RegisterTcmMonitor from: com.android.okhttp.TcmIdleTimerMonitor
W/System (12820): Ignoring header X-Firebase-Locale because its value was null.
D/AndroidRuntime(12820): Shutting down VM
E/AndroidRuntime(12820): FATAL EXCEPTION: main
E/AndroidRuntime(12820): Process: com.yashlathar.gym_in_fluttter, PID: 12820
E/AndroidRuntime(12820): java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/browser/customtabs/CustomTabsIntent$Builder;
E/AndroidRuntime(12820): at com.google.firebase.auth.internal.RecaptchaActivity.zza(com.google.firebase:firebase-auth@@20.0.1:13)
E/AndroidRuntime(12820): at com.google.android.gms.internal.firebase-auth-api.zzth.zzb(com.google.firebase:firebase-auth@@20.0.1:7)
E/AndroidRuntime(12820): at com.google.android.gms.internal.firebase-auth-api.zzth.onPostExecute(Unknown Source:2)
E/AndroidRuntime(12820): at android.os.AsyncTask.finish(AsyncTask.java:695)
E/AndroidRuntime(12820): at android.os.AsyncTask.-wrap1(Unknown Source:0)
E/AndroidRuntime(12820): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
E/AndroidRuntime(12820): at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(12820): at android.os.Looper.loop(Looper.java:164)
E/AndroidRuntime(12820): at android.app.ActivityThread.main(ActivityThread.java:6518)
E/AndroidRuntime(12820): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(12820): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
E/AndroidRuntime(12820): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
E/AndroidRuntime(12820): Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.browser.customtabs.CustomTabsIntent$Builder" on path: DexPathList[[zip file "/data/app/com.yashlathar.gym_in_fluttter-Go_bAHwYifLBQNT8va4B-g==/base.apk"],nativeLibraryDirectories=[/data/app/com.yashlathar.gym_in_fluttter-Go_bAHwYifLBQNT8va4B-g==/lib/arm64, /data/app/com.yashlathar.gym_in_fluttter-Go_bAHwYifLBQNT8va4B-g==/base.apk!/lib/arm64-v8a, /system/lib64, /system/vendor/lib64]]
E/AndroidRuntime(12820): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
E/AndroidRuntime(12820): at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
E/AndroidRuntime(12820): at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
E/AndroidRuntime(12820): ... 12 more
Lost connection to device.

This is the error I m facing with using firebase phone auth and also my app crashes just when I click on my login button. Please Help!!

[Hemant-Gurjar]

Well I overcome the problem using those steps-

In the Google Cloud console, enable the Android DeviceCheck API for your project. (**Note: Select your Firebase project and enable it)
Get SHA-256 fingerprint for for your app.
Go to Settings Page of the Firebase console, select your project and set the SHA-256 fingerprint for your app.
Re-run the app. That solution worked for me. Hope it works for you too.

[Hemant-Gurjar]

Here is solution in my case.

Open your flutter Project directory.
Change directory to android directory in your flutter project directory cd android
clean gradle ./gradlew clean
Build gradle ./gradlew build or you can combine both commands with just ./gradlew clean build
Now run your flutter project. If you use vscode, press F5. First time gradle running assembleDebug will take time.
PS: Delete gradle in case of all that steps don't work