Microsoft Teams Adpative card on clicking button how to open browser window as popup

druuby - 

In general, Adaptive Cards in Teams do not directly support opening a browser window as a popup. They can, however, trigger a Task Module which can then open a webpage in a popup-like experience within Teams.

Here's a sample code snippet that shows how to open a Task Module from an Adaptive Card:

{
    "type": "Action.Submit",
    "title": "Open Popup",
    "data": {
        "msteams": {
            "type": "task/fetch"
        }
    }
}

When this button is clicked, your app will receive an Invoke activity with name task/fetch. Your app should respond to this Invoke activity with a Task Module response that includes the URL of the webpage to open:

{
    "task": {
        "type": "continue",
        "value": {
            "title": "My Popup",
            "url": "https://www.example.com",
            "height": "medium",
            "width": "medium"
        }
    }
}

This will open the webpage in a Task Module, which is a popup-like experience within Teams. However, it will not open a new browser window or tab.