Connectors (Google Drive, Notion) return 403 from macOS desktop app; same account works on claude.ai web

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?

All OAuth-based connector tool calls fail with 403 in the macOS desktop app — including permission-free calls like Google Drive "list recent files" and Notion "get teams". The same account (team workspace) uses both connectors normally on claude.ai web.

Already tried, none helped:

• Disconnected & reconnected both connectors (Google's linked-apps page confirms full Drive scopes were granted)
• Fresh conversations after reconnecting
• Full app quit & restart, and OS reboot
• Signed out and back into the desktop app

What Should Happen?

Connector tool calls succeed in the desktop app, as they do on claude.ai web with the same account.

Error Messages/Logs

Tool call failed: 403

(every Google Drive / Notion connector call: Drive list_recent_files, search_files, read_file_content; Notion get-teams)

Steps to Reproduce

1. In the macOS desktop app, ask Claude to list recent Google Drive files
2. Every Google Drive / Notion connector tool call returns 403
3. The same request on claude.ai web (same account) works fine

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.24012.9 (03c61d) 2026-07-24T04:59:17.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Web working + desktop failing on the same account suggests a token/credential issue in the desktop app's connector gateway. A separate API-token-based Notion MCP integration works fine in the same app, so only OAuth connector auth is affected.