404 on any vehicle.request() type

[DevGW]

Trying to create a basic request to get extended attributes using the ruby SDK.

  def vehicle
    @token = params[:token]
    ap @token
    vehicle_ids = Smartcar.get_vehicles(token: @token).vehicles
    ap vehicle_ids
    vehicle = Smartcar::Vehicle.new(token: @token, id: vehicle_ids.first, options: {unit_system: 'imperial'})
    ap vehicle
    # vehicle_attributes = vehicle.attributes
    path = "#{vehicle.attributes.make}/attributes"
    vehicle_attributes = vehicle.request("GET", path)
    ap vehicle_attributes
    vehicle_attributes.to_h.slice(*%I[id make model year]).to_json

    # API calls to get vehicle info
    ap vehicle.odometer
  end

the vehicle.request is erroring out with a 404:

SmartcarError (RESOURCE_NOT_FOUND:PATH - The requested resource does not exist. Please check the URL and try again.):

the path is being written as 'FORD/attributes' - just like it shows in the API documentation.

I get the test vehicles, I get the basic attributes but cannot get the extended attributes, if someone could point me to what I'm doing wrong I would really appreciate it.

Thanks in advance.