call = client.functions.calls.retrieve(call_id=2, function_id=1)

func = client.functions.retrieve(id=1)
call = func.retrieve_call(id=2)

{
  "items": [
    {
      "id": 4503599627370496,
      "status": "Running",
      "startTime": 1730204346000,
      "functionId": 4503599627370496,
      "endTime": 1730204346000,
      "error": {
        "message": "Could not authenticate.",
        "trace": "Cannot assign foo to bar."
      },
      "scheduleId": 4503599627370496,
      "scheduledTime": 1730204346000
    }
  ]
}