Teams中Power Automate工作流Webhook调用失败，请求格式不符

原本我以为可以借助Teams里的新版Workflow应用，把适用于Microsoft 365连接器的标准Webhook请求发送到目标Webhook URL，经处理后发布到Teams频道。我的工作流结构如图所示：[工作流结构示意图]。

但当我向该工作流发送如下JSON内容时：

{
  "attachments": [
    {
      "type": "AdaptiveCard",
      "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
      "version": "1.5",
      "body": [
        {
          "type": "Container",
          "items": [
            {
              "type": "TextBlock",
              "text": "New TextBlock",
              "wrap": true,
              "weight": "Bolder",
              "size": "Large"
            }
          ]
        },
        {
          "type": "ColumnSet",
          "columns": [
            {
              "type": "Column",
              "width": "stretch",
              "items": [
                {
                  "type": "TextBlock",
                  "text": "Col 1, Row 1:",
                  "wrap": true,
                  "weight": "Bolder"
                },
                {
                  "type": "TextBlock",
                  "text": "Co 2, Row 2:",
                  "wrap": true,
                  "weight": "Bolder"
                }
              ]
            },
            {
              "type": "Column",
              "width": "stretch",
              "items": [
                {
                  "type": "TextBlock",
                  "text": "Col 2, Row 1",
                  "wrap": true
                },
                {
                  "type": "TextBlock",
                  "text": "Col 2, Row 2",
                  "wrap": true
                }
                      ]
                  }
              ]
          }
      ]
  }
  ],
  "type":  "message",
}

收到如下错误响应：

{
    "error": {
        "code": "TriggerInputSchemaMismatch",
        "message": "The input body for trigger 'manual' of type 'Request' did not match its schema definition. Error details: 'Required properties are missing from object: contentType, content.'."
    }
}

我对此感到困惑，因为这个格式看起来和Teams中Workflow应用（Power Automate）处理消息的已知文档格式不匹配，怀疑是微软文档未更新或者自己操作有误，想知道需要用什么JSON Schema格式才能让Workflow/Automate应用的工作流正常运行？

错误提示明确指出缺少contentType和content两个必填属性，这说明你当前使用的是Power Automate手动触发的Request触发器，而非Teams自带的Incoming Webhook连接器。

正确的Request触发器请求格式 #

需要包含contentType和content字段，若发送自适应卡片，contentType需指定为application/vnd.microsoft.card.adaptive，卡片内容放在content中，示例如下：

{
  "contentType": "application/vnd.microsoft.card.adaptive",
  "content": {
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.5",
    "body": [
      {
        "type": "Container",
        "items": [
          {
            "type": "TextBlock",
            "text": "New TextBlock",
            "wrap": true,
            "weight": "Bolder",
            "size": "Large"
          }
        ]
      },
      {
        "type": "ColumnSet",
        "columns": [
          {
            "type": "Column",
            "width": "stretch",
            "items": [
              {
                "type": "TextBlock",
                "text": "Col 1, Row 1:",
                "wrap": true,
                "weight": "Bolder"
              },
              {
                "type": "TextBlock",
                "text": "Co 2, Row 2:",
                "wrap": true,
                "weight": "Bolder"
              }
            ]
          },
          {
            "type": "Column",
            "width": "stretch",
            "items": [
              {
                "type": "TextBlock",
                "text": "Col 2, Row 1",
                "wrap": true
              },
              {
                "type": "TextBlock",
                "text": "Col 2, Row 2",
                "wrap": true
              }
            ]
          }
        ]
      }
    ]
  }
}

额外说明 #

• 若想使用Teams标准Webhook格式（带attachments和type字段），需将工作流触发器切换为Teams的Incoming Webhook，而非Power Automate的Request触发器。
• 若必须保留Request触发器，需严格遵循其Schema要求，后续可在工作流步骤中将接收到的content内容转发至Teams频道。

内容的提问来源于stack exchange，提问作者Thomas Ward