Firebase phone authentication is not working on Android real device

I've been trying to achieve phone auth using Firebase authentication. It's working with an android emulator. I used a test number and a real number in the emulator. Both works. But only the test number is working with a real device and throwing this exception for other numbers

Error is:[firebase_auth/missing-client-identifier] This request is missing a valid app identifier,
meaning that neither SafetyNet checks nor reCAPTCHA checks succeeded.
Please try again, or check the logcat for more details.


I setup SHA key in firebase also.

I am guessing you have not enabled the Device Check API. All you need to do is enable the Device Check API on the cloud platform.

I think after some updates they have made this change that for Safety Net you need SH1 Authentication along with enabling Device Check API.

You can follow the Steps as mentioned [here][1].

Once you enable the device check api. Restart your application. It should work like a charm.

Do lemme know if you need further steps.


[1]:

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I found this after much searching and should work for you or anyone else who stumbles here:

Put this line inside app/build.gradle under dependencies

implementation "androidx.browser:browser:1.2.0"

It is because its do reCAPTCHA verification and opens up browser.

I resolved my issue by removing by old android studio sha-1 and sha-256 keys from firebase and adding a new one from the latest android studio.

I have fixed this error.
In my case I added two android projects with same SHA-1 in single firebase project.
Once I removed one project from firebase project.
Now it is working for me.

There are two ways Firebase Authentication accomplishes this:

> **SafetyNet**: If a user has a device with Google Play Services installed,
> and Firebase Authentication can verify the device as legitimate with
> Android SafetyNet, phone number sign-in can proceed.
>
or
>
> **reCAPTCHA verification**: In the event that SafetyNet cannot be used, such as when the user does not have Google Play Services
> support, or when testing your app on an **emulator**.


So your solution is either one of two

- **Retest on a real device**

- Add **reCAPTCHA verification** functionality to your app so you can
proceed with your emulator.

Android has added **SafetyNet** you can read more [here][1]. But what you have to do is <br/><br/>**1.** enable the Android Device verification api [here][2]. and<br/><br/> **2.** If you haven't yet specified your app's SHA-256 fingerprint, do so from the Settings Page of the Firebase console. For more info read [details here.][3]


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**SafetyNet** is newly developed feature for android. But solved the issue without doing any changes in the App.

Following steps helped me to solve.

**Release Version**


1. Google Signs the Appbundle when you upload. So, Find and copy the SHA1 key of the app signed by google.
[Google Play Console - App Signing Key][2]


[![enter image description here][3]][3]


2. Navigate to your project **-> Project Settings** in Firebase Console and add SHA1 key by clicking on **Add fingureprint**.
[![enter image description here][4]][4]


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[2]:

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[3]:

[4]:

**Debug version**


1. Navigate to android directory of your project with following command with Terminal.

> cd android

2. Generate app signingReport and copy the SHA1 key

> gradlew signingReport
>
> on Mac :
>
> ./gradlew signingReport

[![enter image description here][1]][1]


3. Add the SHA1 key in firebase app.

This was worked for me :-
If your app is published on the play store, Copy App signing key certificate from the Google Play console (**Release > Setup > App Integrity page**). Insert your signing key to your Firebase Console(**Project settings Page**).

Follow this link - [

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][1]


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I removed my phone number from phone number for testing on firebase and it was worked for me when working on real device not emulator.