Pushing data on API wont go through

Question

I'm using the hubspot V3 deal API to create a deal, the deal is being created successfully but it's pipeline property is not.

The problem with it's pipeline property is that it sets it to null, I have tried setting pipline value to, pipeline's name and pipeline's id but it returns null after deal is created.

API Endpoint docs - https://developers.hubspot.com/docs/api/crm/deals ( create )

axios.post('https://api.hubapi.com/crm/v3/objects/deals?hapikey={apiKEY}', {
    "properties": {
      "dealname": `test // hello`,
      "hubspot_owner_id": `owner_id`,
      "pipeline": "Cold Outbound"
    }
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  });