it does work for me, using directly on a notebook cell (havent tried in vscode). 

This is my sample Json 

{
  "name": "Agregacao_Gold",
  "email_notifications": {},
  "webhook_notifications": {},
  "timeout_seconds": 0,
  "max_concurrent_runs": 1,
  "queue": {
    "enabled": True
  },
  "run_as": {
    "user_name": "mhiltner@community.com"
  }
}

 What i meant is that maybe your job_dict variable is not storing your job as a dict type and this could be causing an error. If you dont mind, feel free to share the result of printing your job_dict