Teams Connectors Actionable Message throwing Target URL Not Found

BaluVijayaKumar - We tried sending cards with Action.OpenUrl/Action.ShowCard via incoming webhook. Cards are posted successfully. Below is the card that we posted. 

{
   "type":"message",
   "attachments":[
      {
         "contentType":"application/vnd.microsoft.card.adaptive",
         "contentUrl":null,
         "content":{
            "$schema":"http://adaptivecards.io/schemas/adaptive-card.json",
            "type":"AdaptiveCard",
            "version":"1.2",
            "body":[
                {
                "type": "TextBlock",
                "text": "For Samples and Templates, see [https://adaptivecards.io/samples](https://adaptivecards.io/samples)"
                }
            ],
            "actions": [
    {
      "type": "Action.OpenUrl",
      "title": "Action.OpenUrl",
      "url": "https://adaptivecards.io"
    }
  ]
         }
      }
   ]
}

Can you confirm if you are still facing this issue, if yes can you please share the JSON that you tried to send?