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Firebase Auth Encountering the error code 'auth/invalid-oauth-client-id' during authentication.

The OAuth client ID used in the application is invalid.

Understanding Firebase Auth

Firebase Authentication is a comprehensive tool provided by Google Firebase that allows developers to implement secure authentication systems in their applications. It supports various authentication methods, including email/password, phone numbers, and federated identity providers like Google, Facebook, and Twitter. The primary purpose of Firebase Auth is to simplify the process of managing user authentication and identity verification in applications.

Identifying the Symptom

When using Firebase Auth, you might encounter the error code 'auth/invalid-oauth-client-id'. This error typically appears when attempting to authenticate users through OAuth providers, such as Google Sign-In. The symptom is usually a failed authentication attempt, accompanied by an error message indicating an invalid OAuth client ID.

Explaining the Issue

The error code 'auth/invalid-oauth-client-id' signifies that the OAuth client ID configured in your Firebase project does not match the expected value. This mismatch can occur due to several reasons, such as incorrect configuration in the Firebase console or using an outdated client ID.

Common Causes

  • The OAuth client ID was not correctly set up in the Firebase console.
  • The client ID used in the application code does not match the one in the Firebase console.
  • Changes in the OAuth client configuration were not updated in the application.

Steps to Fix the Issue

To resolve the 'auth/invalid-oauth-client-id' error, follow these steps:

Step 1: Verify OAuth Client ID in Firebase Console

  1. Navigate to the Firebase Console.
  2. Select your project from the list of projects.
  3. Go to the Authentication section.
  4. Under the Sign-in Method tab, locate the OAuth provider you are using (e.g., Google).
  5. Ensure that the OAuth client ID listed matches the one you are using in your application.

Step 2: Update Application Code

  1. Open your application code where the OAuth client ID is specified.
  2. Replace the existing client ID with the correct one from the Firebase console.
  3. Save the changes and redeploy your application if necessary.

Step 3: Test the Authentication Flow

  1. Run your application and attempt to authenticate using the OAuth provider.
  2. Ensure that the authentication process completes successfully without errors.

Additional Resources

For more information on setting up OAuth providers in Firebase, refer to the official Firebase Authentication Documentation. If you continue to experience issues, consider reaching out to the Firebase Support team for further assistance.

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Firebase Auth Encountering the error code 'auth/invalid-oauth-client-id' during authentication.

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