Does anyone know what’s happening here?

I’m calling the /api/campaign-recipient-estimations/<campaign_id> endpoint, i first get all the user campaigns and then cycle through each campaign to get it’s recipient estimation, i’m getting this weird error

{
  "errors": "
    {
      "id": "6f3bd40f-6a67-463e-a28c-02061e0e0027",
      "status": 404,
      "code": "error",
      "title": "A server error occurred.",
      "detail": "No results or results were out of date. Schedule a new estimation or wait for your estimation to complete.",
      "source": {
        "pointer": "/data/"
      }
    }
  ]
}

It doesn’t happen always though, for most campaigns it works fine, but then fails randomly

This is my axios request config for getting recipient estimation

{
  method: 'GET',
  url: `https://a.klaviyo.com/api/campaign-recipient-estimations/${args.campaignId}`,
  headers: {
    accept: 'application/json',
    'content-type': 'application/json',
    revision: constant.KLAVIYO_API_VERSION,
    Authorization: `Klaviyo-API-Key ${args.apiKey}`,
  },
}