Azure Blob Storage触发器的Logic App无法保存，请求技术支持

我正尝试创建一个简单的Logic App，逻辑为：当Azure Blob Storage中Blob被添加或更新时，向Slack发送一条消息。但目前无法保存这个应用，原因未知。

以下是应用代码：

{
  "definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"actions": {
  "Publicar_mensaje_(v2)": {
    "type": "ApiConnection",
    "inputs": {
      "host": {
        "connection": {
          "referenceName": "slack"
        }
      },
      "method": "post",
      "body": {
        "channel": "C04MV4K08TW",
        "text": "Test from Azure Logic App :::{hidden}:::"
      },
      "path": "/v2/chat.postMessage"
    },
    "runAfter": {},
    "trackedProperties": {}
  }
},
"contentVersion": "1.0.0.0",
"outputs": {},
"triggers": {
  "When_a_blob_is_added_or_updated": {
    "type": "ServiceProvider",
    "inputs": {
      "parameters": {
        "path": "configurationscontainer/configurations_mock.json"
      },
      "serviceProviderConfiguration": {
        "connectionName": "AzureBlob-2",
        "operationId": "whenABlobIsAddedOrModified",
        "serviceProviderId": "/serviceProviders/AzureBlob"
      }
    },
    "conditions": [],
    "trackedProperties": {
      "key": "connectionvalue"
    }
  }
}
 },
"connectionReferences": {
"AzureBlob-2": {
  "api": {
    "id": "/serviceProviders/AzureBlob"
  },
  "connection": {
    "id": "/serviceProviders/AzureBlob/connections/AzureBlob-2"
  },
  "connectionName": "AzureBlob-2",
  "authentication": {
    "type": "ManagedServiceIdentity"
  }
},
"slack": {
  "api": {
    "id": "/subscriptions/{hidden_id}/providers/Microsoft.Web/locations/westeurope/managedApis/slack"
  },
  "connection": {
    "id": "/subscriptions/{hidden_id}/resourceGroups/{hidden}/providers/Microsoft.Web/connections/slack"
  },
  "connectionName": "slack",
  "authentication": {
    "type": "ManagedServiceIdentity"
  }
}
},
"parameters": {}
}

错误信息见下图：

这是我开发的第一个Logic App，此前已做过大量调研但未找到解决方法，恳请各位提供帮助，万分感谢！

内容的提问来源于stack exchange，提问作者MadDev