Webhook messages aren't delivered from azure functions

abdul_kareem_mohamme - We checked this at our end, we made a change to the card to make sure it follows this pattern. It is working fine. - https://learn.microsoft.com/en-us/microsoftteams/platform/task-modules-and-cards/cards/cards-format?tabs=adaptive-md%2Cdesktop%2Cconnector-html#user-mention-in-incoming-webhook-with-adaptive-cards

We need to add "<at>Admin</at>"(Same as text property in entities) in text block of body so that it will show the @mention properly. We also replaced the text in entities block. Below is the final JSON.

{
    "type": "message",
    "summary": "test",
    "attachments": [
        {
            "contentType": "application/vnd.microsoft.card.adaptive",
            "contentUrl": null,
            "themeColor": "0072C6", 
            "summary": "test",
            "content": {
                "type": "AdaptiveCard",
                "body": [
                    {
                        "type": "TextBlock",
                        "size": "Large",
                        "weight": "Bolder",
                        "text": "test",
                        "wrap": true
                    },
                    {
                        "type": "TextBlock",
                        "size": "Large",
                        "weight": "Bolder",
                        "text": "messageTitle",
                        "wrap": true
                    },
                    {
                        "type": "TextBlock",
                        "size": "Medium",
                        "text": "Hi <at>Admin</at>",
                        "wrap": true
                    }
                ],
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
                "version": "1.0",
                "padding": "None",
                "msteams": {
                    "width": "Full",
                    "entities": [
                        {
                            "type": "mention",
                            "text": "<at>Admin</at>",
                            "mentioned": {
                                "id": "admin@M365x17798679.onmicrosoft.com",
                                "name": "Admin"
                            }
                        }
                    ]
                }
            }
        }
    ]
}

If you are still facing the issue even after making these changes, could you please share demo credentials where this issue is reproducible. Please share the credentials at microsoftteamsdev@microsoft.com.