Keyboard shortcut to insert snippet doesn't work

[Rudd-O]

// Place your key bindings in this file to override the defaults
[
    {
        "key": "ctrl+shift+n",
        "command": "editor.action.insertSnippet",
        "when": "editorTextFocus",
        "args": {
            "name": "txn*",
            "langId": "beancount"
        }
    }
]

has no effect. If I omit name, then I get the dropdown, but this isn't ideal.

Ideas?