OAuth Authentication Not Supported for Claude Code CLI

Bug Description
I am in terminal, and already authenticated (I must be since I can send this message from claude code, and I get this oAuth error: API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."}}

Environment Info

• Platform: darwin
• Terminal: windsurf
• Version: 1.0.83
• Feedback ID: f10dc293-de25-42b1-a3cd-04ffba672c6f

Errors

[{"error":"Error: 401 {\"type\":\"error\",\"error\":{\"type\":\"authentication_error\",\"message\":\"OAuth authentication is currently not supported.\"}}\n    at D6.generate (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:942:2449)\n    at sP.makeStatusError (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:959:2101)\n    at sP.makeRequest (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:959:5315)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async KSB.sG1.showErrors (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1875:24578)\n    at async sG1 (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1875:13705)\n    at async KSB (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1875:24429)\n    at async file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1875:19524\n    at async cN0 (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1875:5164)\n    at async V01 (file:///Users/tobymorning/.nvm/versions/node/v20.19.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1875:19494)","timestamp":"2025-08-18T22:14:52.671Z"}]