Token exchange failed: Forbidden when running happy connect claude

[wangxipeng88]

Description

Running happy connect claude fails with "Token exchange failed: Forbidden" error. This was working previously but has recently stopped working.

Steps to Reproduce

1. Run happy connect claude in terminal
2. Browser opens Claude OAuth authorization page
3. After authorization, callback returns to localhost:54545/callback with a code
4. Token exchange fails with "Forbidden"

Error Output

🔌 Connecting Anthropic to Happy cloud

🚀 Registering Anthropic token with server
🚀 Starting Anthropic Claude authentication...
📡 Using callback port: 54545
📋 Opening browser for authentication...

❌ Failed to authenticate with Anthropic
Error: Token exchange failed: Forbidden

Environment

• happy-coder version: 0.13.0
• Claude Code version: 2.1.81
• OS: macOS Darwin 25.3.0