[BUG] Atlassian connector OAuth callback fails - "연결할 수 없음"

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When trying to connect the Atlassian connector, OAuth callback fails with "연결할 수 없음" error.

Steps:

1. Settings → Connectors → Atlassian → Click Connect
2. Select woowahanbros.atlassian.net
3. Accept → Browser shows "연결할 수 없음"

Error reference: ofid_9c06fb97f8e3800c
OS: macOS, Claude Code desktop (Korean)

What Should Happen?

Atlassian connector should connect successfully and return to the app

Error Messages/Logs

Error reference: ofid_9c06fb97f8e3800c

Steps to Reproduce

1. Settings → Connectors → Atlassian
2. Click Connect
3. Select woowahanbros.atlassian.net
4. Click Accept
5. Browser shows "연결할 수 없음" (Cannot connect) error

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

unknown (desktop app)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="2000" height="1139" alt="Image" src="https://github.com/user-attachments/assets/3e5cce3c-6238-489b-9ee2-6ffb29f2aa55" />
<img width="654" height="431" alt="Image" src="https://github.com/user-attachments/assets/4198d4bc-6ffd-4a71-84cc-f869435d45b6" />