Generating the authentication token Using OAuth 2.0 for calling Google developer API

Question

I am trying to generate the authentication token using OAuth 2.0 for the .NET MAUI application using the Google Cloud Console project to call the Google Developer API. For that, I created the project on the Google Cloud console, enabled the Google developer API and configured the consent screen with an external app type, created the OAuth 2.0 client ID with application type Android, and added the package name and SHA-1 fingerprint. I installed the NuGet packages below for the MAUI project.

1. Microsoft.Identity.Client
2. System.Net.Http.Json.

I added the below code to implement the OAuth flow on the MAUI Project.

On MainActivity.cs:

public

On AndroidManifest.xml:

<activity android:name="MainActivity"
  android:exported="true">

To generate the access token from the below function I calling the GoogleAuthService();

private

If I click on LoginButton, It navigates to the Microsoft login page, and If I try to log in with mail, it shows the below error.

We're unable to complete your request unauthorized_client: The client does not exist or is not enabled for consumers. If you are the application developer, configure a new application through the App Registrations in the Azure Portal at https://go.microsoft.com/fwlink/?linkid=2083908.

Screenshot:

So, I am unable to generate the authentication token using OAuth 2.0. Is this process correct? How can I generate the authentication token to call the Google Developer API for .NET MAUI Apllication?

Please suggest a solution for this.

Answer 1

Hello,

We're unable to complete your request unauthorized_client: The client does not exist or is not enabled for consumers. If you are the application developer, configure a new application through the App Registrations in the Azure Portal at https://go.microsoft.com/fwlink/?linkid=2083908.

This error message is usually caused by the Azure side not configuring the account authentication correctly.

In the Q&A, some users have encountered the same error message and solved the problem by configuring Manifest.

You could refer to unauthorized_client: The client does not exist or is not enabled for consumers for more detailed information.

Best Regards,

Alec Liu.

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Answer 2

You appear to be trying to use azure to get the token, but you need to use googles oauth server.

https://developers.google.com/identity/protocols/oauth2