ChatGPT custom app shows action discovery failed

[dandry]

Hello,

Thank you for this plugin! I'd really like to give it a spin with ChatGPT web (not Codex).

Reproduction steps:

1. Install the plugin on the target website.
2. Enable AI/MCP option in the plugin.
3. Generate app password for your admin user.
4. In ChatGPT, enable Developer Mode.
5. Add new app, providing the URL of https://example.com/wp-json/mcp/lw-site-manager.
6. Select Authentication type of Access token / API key.
7. Select Header scheme of Basic and and click Create.
8. Then try to connect with the app, a popup will show to provide the key. It has to be base64 encoded username and app password. You can use the following terminal command to generate it in macOS/Linux: printf '%s' 'user:app_password' | base64.
9. Click Connect.
10. The interface shows an error. The response in dev tools:

{
    "detail": {
        "error_code": "MCP_ACTION_DISCOVERY_FAILED",
        "message": "Authentication succeeded, action discovery failed",
        "connector_id": "asdk_app_6a68a86408588191bb60e9f7088c3f1a",
        "link_id": "link_6a68af57ac448191aef2cc65d17e1d28",
        "cause": {
            "status_code": 401,
            "detail": "Reauthentication required"
        }
    }
}

Would be great to have it working with ChatGPT.
Thank you.