[BUG] Gamma connector OAuth completes but connector never registers as connected

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?

The Gamma connector in Claude Code (desktop app, macOS) fails to connect despite completing the full OAuth flow successfully. After approving access in Gamma and clicking "Open Claude" in the browser dialog, Gamma still shows under "Not connected" in the Connectors list. No Gamma tools appear in new conversations.

What Should Happen?

After completing the OAuth flow, Gamma should appear under connected connectors and Gamma tools should be available in new conversations.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code → Settings → Connectors
2. Click Gamma → Connect
3. Browser opens gamma.app OAuth page — approve access ("Allow")
4. Browser redirects to claude.ai/desktop/connected — page shows "Connected ✓"
5. Chrome dialog "Open Claude?" appears — check "Always allow" and click "Open Claude"
6. Claude desktop app comes to foreground
7. Gamma still shows under "Not connected" in Connectors list
8. Open a new conversation and ask for Gamma tools — none are available

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.143 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• The Connectors UI also shows Notion as "Not connected", but Notion actually works (claude mcp list confirms it as connected). The UI appears unreliable/not synced.
• Restarting the Claude desktop app does not resolve the issue.
• Repeated the full OAuth flow multiple times — same result every time.
• Workspace: AweSM Support (support@awesm.com)
• Platform: macOS, Claude desktop app

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<img width="1512" height="982" alt="Image" src="https://github.com/user-attachments/assets/7b432944-623c-4180-a446-0eceefd48fb7" />

<img width="1512" height="982" alt="Image" src="https://github.com/user-attachments/assets/cba68887-866d-42f2-be00-c2ed84bc5659" />