[BUG] Google Calendar connector returns "Not connected" after OAuth granted

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?

Steps to reproduce:

1. Connect Google Calendar with a Google account (ej.meeting10@gmail.com)
2. OAuth completes successfully — Google Account shows "Claude for Google Calendar"

with full calendar permissions granted

1. Any API call (list_calendars, list_events) returns "Not connected"
2. Refreshing tools list, disconnecting/reconnecting, restarting Claude Code

all have no effect

Expected: API calls succeed after OAuth is granted
Actual: Always returns "Not connected"

Note: A different Google account (ej.meeting8@gmail.com) connected successfully
with the same connector previously.

What Should Happen?

API calls (list_calendars, list_events, create_event) should work after OAuth is completed and calendar permissions are granted.

Error Messages/Logs

Steps to Reproduce

1. Connect Google Calendar connector with Google account A (ej8) → works fine
2. Disconnect, reconnect with Google account B (ej10) → OAuth completes, all permissions granted
3. Call list_calendars → returns "Not connected"
4. Restart Claude Code, refresh tools list → same error

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.154 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_