Fix Firebase code 400 "message" - "CONFIGURATION_NOT_FOUND" error
Quick answer
Firebase error 400 CONFIGURATION_NOT_FOUND during authentication means the sign-in method you are calling is not enabled for the project. Open the Firebase console, go to Authentication, then Sign-in method, and enable the provider (Email/Password, Google, and so on). Also confirm your client is initialised with the correct apiKey and projectId for that Firebase project.
This guide will walk you through the most common Firebase configuration errors and how to fix them.
Let's fix Firebase error 400 message: CONFIGURATION_NOT_FOUND.
Firebase code 400 is an exception that you might encounter while using the Firebase SDKs. This exception occurs when there is a mismatch in the Firebase configuration. We will see how to fix this issue by following some basic troubleshooting steps and by fixing the project structure.
``you need to enable the Sign-in method under Authentication in firebase console.`
The Firebase admin dashboard allows you to manage your Firebase databases as a Google Cloud Platform (GCP) project. Within the dashboard, you can view your App's data, configure security and access rules, and much more.
Software Engineering Leader & Technical Author · Updated July 21, 2026