caller does not have permission” after revoke/reconnect and fresh OAuth flows

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?

I’m unable to use the Gmail connector in Claude because it consistently fails with:

caller does not have permission

I have already tried the usual recovery steps, including:

Revoking the Google account access

Reconnecting the account

Starting fresh OAuth flows

Using new sessions after reconnecting

None of these steps resolved the issue. The connector still fails with the same permission error.

What Should Happen?

I have already tried the usual recovery steps, including:

Revoking the Google account access

Reconnecting the account

Starting fresh OAuth flows

Using new sessions after reconnecting

None of these steps resolved the issue. The connector still fails with the same permission error.

Error Messages/Logs

Claude should be able to access Gmail after a successful OAuth authorization and connector reconnect.

Steps to Reproduce

I have already tried the usual recovery steps, including:

Revoking the Google account access

Reconnecting the account

Starting fresh OAuth flows

Using new sessions after reconnecting

None of these steps resolved the issue. The connector still fails with the same permission error.

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

Claude Sonnet 4.6 (model ID: claude-sonnet-4-6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_