Markdown issue for crossed out text

[greenya]

Hello.

I need to have a crossed out text in MS Teams conversation feed. I'm sending JSON to working Incomming Webhook, which takes a message which has an attachment -- an AdaptiveCard. I need to show a value change and the old value i need to cross out. I did this 3 ways using TextBlock and 1 way with FactSet. The online designer tool shows what i need, but the message in the actual MS Team conversion is not rendered correctly.

Designer tool test only AdaptiveCard json, and not whole json (message). So i was thinking maybe the message itself should declare some sort of text style interpretation, but __Date__ is rendered correctly which is clearly a markdown syntax.

The json i'm using

{
    "type": "message",
    "attachments": [
        {
            "contentType": "application/vnd.microsoft.card.adaptive",
            "content": {
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
                "type": "AdaptiveCard",
                "version": "1.0",
                "body": [
                    { "type": "TextBlock", "text": "DATA UPDATED", "wrap": true, "size": "large" },
                    { "type": "TextBlock", "text": "__Date__: Nov 6, 2021 ~~Oct 30, 2021~~", "wrap": true },
                    { "type": "TextBlock", "text": "__Date__: Nov 6, 2021 <s>Oct 30, 2021</s>", "wrap": true },
                    { "type": "TextBlock", "text": "__Date__: Nov 6, 2021 <strike>Oct 30, 2021</strike>", "wrap": true },
                    { "type": "FactSet", "facts": [ { "title": "Date", "value": "Nov 6, 2021 ~~Oct 30, 2021~~" } ] }
                ],
                "actions":[
                    { "type": "Action.OpenUrl", "title": "View", "url": "https://wwww.google.com/" },
                    { "type": "Action.OpenUrl", "title": "Edit", "url": "https://wwww.google.com/" }
                ]
            }
        }
    ]
}

The difference in rendering: left -- the online tool with "MS Teams - Light" set as host app, right -- actual rendering of a posted message

Any idea how to make crossed out text effect in MS Teams message?

Thank you.