How to prevent token conflicts between your app, widgets, and background services

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iOS apps with extensions (widgets, app clips, notification services) can experience OAuth race conditions when multiple processes try to refresh tokens simultaneously. Using NSFileCoordinator as a file-based locking mechanism prevents token conflicts by ensuring only one process updates authentication state at a time. The solution implements lock acquisition with exponential backoff retries, performs the token refresh while holding the lock, then releases it. This approach eliminates authentication failures, unexpected logouts, and hard-to-trace bugs without requiring external SDKs.

Fixing OAuth Race Conditions in iOS Mobile Apps with App Extensions

Why OAuth Fails in Mobile Apps Using iOS Extensions

Real-World Example: OAuth Token Conflicts in a Mobile App

Summary: A Lightweight OAuth Fix for Stable iOS App Auth