Gmail connector cannot switch google accounts "you have some access already" is blocking re-authentication

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?

Title:
Gmail connector cannot switch Google accounts — "you have some access already" blocks re-authentication

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Detailed Issue:

Description:

The Gmail MCP connector in Claude (desktop app, Windows 11) does not allow switching the authenticated Google account once an initial connection has been established. When attempting to disconnect one Google account and reconnect with a different account, the connector displays the message "you have some access already" and completes without actually re-authenticating with the new account. The connector appears connected but all tool calls return Not connected.

Steps to Reproduce:

1. Open Claude desktop app → Settings → Connectors
2. Connect Gmail with Account A (xxxxxx.gmail.com) — works correctly
3. Disconnect Gmail connector from Account A
4. Click Connect Gmail and authenticate with Account B (xxxx.xxxxx@route2cloud.com, a Google Workspace account)
5. Claude shows "you have some access already" and skips the full OAuth flow
6. Connector shows as connected but Gmail MCP tools return Not connected error when called

Expected Behavior:
After disconnecting Account A and reconnecting with Account B, the OAuth flow should complete fully for Account B and all Gmail MCP tools should work against Account B's inbox.

Actual Behavior:
Claude's backend detects a cached/stale token from the previous connection and short-circuits the OAuth flow with "you have some access already." The resulting connection is broken — tools return Not connected.

Workarounds Attempted:

• Cleared browser and app cache — no effect
• Revoked Claude's access from Google account settings (myaccount.google.com/permissions) — no effect
• Refreshed page and started a new session — no effect
• The issue persists because the OAuth token appears to be stored server-side in Claude's infrastructure, not locally

Environment:

• OS: Windows 11 Home (10.0.26200)
• Claude app: Desktop (Windows)
• Account type being added: Google Workspace (not personal Gmail)
• Connector: Gmail (MCP UUID: b4d7feb8-16de-42ec-895c-f5f0023dbb02)

Impact:
Users with multiple Google accounts (especially those with a personal Gmail and a Google Workspace account) cannot switch the Gmail connector to a different account without a server-side token reset on Anthropic's end.

What Should Happen?

Claude should allow me to disconnect the gmail account and connect the correct account, which worked previously

Error Messages/Logs

Steps to Reproduce

not applicable

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

You are running Claude desktop app version 1.7196.0.0 on Windows 11 Home (10.0.26200). Add this to the bug report under Environment: - Claude desktop app version: 1.7196.0.0 - OS: Windows 11 Home (10.0.26200) - Platform: Windows (Microsoft Store / AppX package)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_