facebook - 像素事件设置问题

Question

在向 facebook adsets 端点发送请求时，我们收到此错误，

"You may need to set up this event on a domain. If you've already configured your event in Events Manager, manually turn on and publish your ad set. Otherwise, select a new event. If your ad set has already been published, you must duplicate it first before changing its event or optimisation goal."

我们正在使用沙盒广告帐户。该域设置为跟踪浏览量和购买事件，使用 facebook 像素助手版本 2.2.0 进行验证。

请查看发送到广告集端点的数据，

{
  name: "xxx",
  campaign_id: "a valid id",
  start_time: "a valid id",
  billing_event: "IMPRESSIONS",
  bid_amount: "10",
  targeting: "{ \n        \"geo_locations\": {\"countries\":['US']},  'genders': [1], 'age_min': 21, 'age_max': 65, 'locales': [6, 24]}",
  promoted_object: '{\n  "pixel_id":'+"a valid pixel id"+',\n  "custom_event_type": "PURCHASE"\n}',
  daily_budget: 7000,
  status: "PAUSED"
}