getListById always returns 404

I have created a list, and when trying to access the list using the SDK it always returns a 404 error:

```js
    const list = new ListApi();
    const id = await list.getListById("my-list-name");
```
Which submits the following URL:

```
https://api.sendx.io/api/v1/rest/list/my-list-name
```

Which fails with a 404 error.


 