Microsoft Graph Explorer presents schema error for the "Adaptive Card" type

I’m looking for guidance regarding an error when using the Microsoft Graph Explorer POST method for "Adaptive Card" to Microsoft Teams.

Below, you can notice that the communication works fine when I use a simpler JSON. However, when I use the "Adaptive Card" type JSON, I receive the error message: "Property body in payload has a value that does not match schema.":

success JSON

{ "body": { "content": "Hello World" } }

not success JSON

Link adaptive cards samples

{

  "type": "AdaptiveCard",

  "body": [

    {

      "type": "TextBlock",

      "size": "medium",

      "weight": "bolder",

      "text": "${title}",

      "style": "heading",

      "wrap": true

    },

    {

      "type": "ColumnSet",

      "columns": [

        {

          "type": "Column",

          "items": [

            {

              "type": "Image",

              "style": "person",

              "url": "${creator.profileImage}",

              "altText": "${creator.name}",

              "size": "small"

            }

          ],

          "width": "auto"

        },

        {

          "type": "Column",

          "items": [

            {

              "type": "TextBlock",

              "weight": "bolder",

              "text": "${creator.name}",

              "wrap": true

            },

            {

              "type": "TextBlock",

              "spacing": "none",

              "text": "Created {{DATE(${string(createdUtc)}, SHORT)}}",

              "isSubtle": true,

              "wrap": true

            }

          ],

          "width": "stretch"

        }

      ]

    },

    {

      "type": "TextBlock",

      "text": "${description}",

      "wrap": true

    },

    {

      "type": "FactSet",

      "facts": [

        {

          "$data": "${properties}",

          "title": "${key}:",

          "value": "${value}"

        }

      ]

    }

  ],

  "actions": [

    {

      "type": "Action.ShowCard",

      "title": "Set due date",

      "card": {

        "type": "AdaptiveCard",

        "body": [

          {

            "type": "Input.Date",

            "label": "Enter the due date",

            "id": "dueDate"

          },

          {

            "type": "Input.Text",

            "id": "comment",

            "isMultiline": true,

            "label": "Add a comment"

          }

        ],

        "actions": [

          {

            "type": "Action.Submit",

            "title": "OK"

          }

        ],

        "$schema": "http://adaptivecards.io/schemas/adaptive-card.json"

      }

    },

    {

      "type": "Action.OpenUrl",

      "title": "View",

      "url": "${viewUrl}",

      "role": "button"

    }

  ],

  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",

  "version": "1.5"

}