Web Reference: While the error message is straightforward, resolving it requires understanding how Firebase and OAuth providers validate redirect domains. In this guide, we’ll break down the root causes of the error and walk through step-by-step solutions to get your local development environment back on track. Jan 3, 2018 · message: "This domain (mail-demo-fcm.firebaseapp.com) is not authorized to run this operation. Add it to the OAuth redirect domains list in the Firebase console -> Auth section -> Sign in method tab." Oct 18, 2025 · Fix Firebase Authentication sign-in errors across web, mobile, and backend apps. Learn the causes, solutions, and code examples for each platform
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