[google_sign_in][web]: Authentication asked twice

[aleripe]

Steps to reproduce

1. Run the packages google_sign_in example
2. Press the Sign in with Google button
3. User is asked an account
4. User is now signed in successfully
5. Presse the Request permissions button

Expected results

User is asked for authorization to access the Contacts API

Actual results

User is asked an account again

Code sample

Code sample

Use the packages google_sign_in example

Screenshots or Video

Screenshots / Video demonstration

Logs

Logs

Flutter Doctor output

Doctor output

[√] Flutter (Channel stable, 3.35.3, on Microsoft Windows [Versione 10.0.19045.6396], locale it-IT) [1.493ms]
    • Flutter version 3.35.3 on channel stable at C:\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision a402d9a437 (5 weeks ago), 2025-09-03 14:54:31 -0700
    • Engine revision ddf47dd3ff
    • Dart version 3.9.2
    • DevTools version 2.48.0
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android,
      enable-ios, cli-animations, enable-lldb-debugging

[√] Windows Version (10 Pro 64 bit, 22H2, 2009) [6,3s]

[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [8,6s]
    • Android SDK at C:\Users\Alessandro\AppData\Local\Android\sdk
    • Emulator version 36.1.9.0 (build_id 13823996) (CL:N/A)
    • Platform android-36, build-tools 35.0.0
    • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.7+-13880790-b1038.58)
    ! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses

[√] Chrome - develop for the web [734ms]
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[!] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.14.12) [730ms]
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.14.36408.4
    X Visual Studio is missing necessary components. Please re-run the Visual Studio installer for the "Desktop
      development with C++" workload, and include these components:
        MSVC v142 - VS 2019 C++ x64/x86 build tools
         - If there are multiple build tool versions available, install the latest
        C++ CMake tools for Windows
        Windows 10 SDK

[√] Android Studio (version 2025.1.3) [33ms]
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = C:\Program Files\Android\Android Studio
    • Java version OpenJDK Runtime Environment (build 21.0.7+-13880790-b1038.58)

[√] VS Code (version 1.99.2) [27ms]
    • VS Code at C:\Users\Alessandro\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.108.0

[√] Connected device (3 available) [980ms]
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Versione 10.0.19045.6396]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 140.0.7339.208
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 141.0.3537.57

[√] Network resources [891ms]
    • All expected network resources are available.

</details>

[darshankawar]

@aleripe Thanks for the report.
I am unable to replicate this using the package example running on S10+ device with latest plugin version.
*>

• User is now signed in successfully
• Presse the Request permissions button

I didn't get this step while replicating. Can you provide us a short video of this ?

[aleripe]

@aleripe Thanks for the report. I am unable to replicate this using the package example running on S10+ device with latest plugin version. *>

• User is now signed in successfully
• Presse the Request permissions button

I didn't get this step while replicating. Can you provide us a short video of this ?

Sorry, I forgot to specify as Google Sign In Button is specifically for web, but this happens only on the web environment.

[darshankawar]

Ok, thanks for the update. Running the plugin example on web and tapping on Google Sign in button is giving me a bad server request error which I'll try to figure out. Meanwhile, keeping the issue open for team's tracking.

[aleripe]

Have you updated your Google Client Id in index.html?

[darshankawar]

Have you updated your Google Client Id in index.html?

Thanks, yes, that was the issue. The client-id wasn't a valid one. I updated it with new and then was able to see the reported behavior. After signing in and then tapping on request permissions, it shows below:

But behind this authorization, there's a message that is displayed:

Authorization needed to read your contacts so maybe that's the reason the authentication is asked twice ? So this seems expected behavior @aleripe ?

Upon again login, then it shows below screen