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Claude CodeAPI KeyTroubleshootingError FixSetup Guide

Fix: Claude Code 'API Key Not Found' Error — Complete Troubleshooting Guide

Step-by-step guide to fixing the 'API key not found' error in Claude Code for Windows, macOS, and Linux. Covers .env setup, environment variables, CLI config, and common pitfalls.

May 11, 202610 min read

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