The deployment of Firebase App Check is a critical security milestone, but it often results in an immediate service disruption for developers and legitimate users. The error usually manifests as a Status{code=PERMISSION_DENIED, description=Missing or insufficient permissions} (gRPC code 7) when accessing Firestore, Realtime Database, or Cloud Storage. This error indicates that the backend service requires a valid App Check token to fulfill the request, but the client failed to provide one that the server trusts. While the goal is to block abuse, this configuration often inadvertently blocks local emulators, simulators, and CI environments because they cannot pass standard attestation checks (like Play Integrity or App Attest). This guide details the root cause of these failures and provides rigorous implementation patterns for Android and iOS to resolve them using Debug Providers. The Anatomy of Error Code 7 To fix the error, you must understand the failure point. A...
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