[Rendering] Mentions in Teams Message Extension do not work

Target Platforms

Other

SDK Version

Cards: 3.1.0, Templating: 1.5.0, Expressions: 4.22.7

Application Name

Microsoft Teams

Problem Description

When viewing Mentions via an adaptive card in a message extension, the mentions do not render correctly. Instead the render with Name. This only appears to happen in the web/desktop version of Teams, as mobile still works correctly.

Screenshots

Card JSON

{
    "$schema": "https://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.5",
    "type": "AdaptiveCard",
    "body": [
        {
            "type": "TextBlock",
            "text": "<at>Adele Vance</at>, <at>Isaiah Langer</at>, <at>Kallen (Stadtfeld) Kozuki</at>"
        }
    ],
    "msteams": {
        "entities": [
            {
                "type": "mention",
                "text": "<at>Adele Vance</at>",
                "mentioned": {
                    "id": "<entraId>",
                    "name": "Adele Vance"
                }
            },
            {
                "type": "mention",
                "text": "<at>Isaiah Langer</at>",
                "mentioned": {
                    "id": "<entraId>",
                    "name": "Isaiah Langer"
                }
            },
            {
                "type": "mention",
                "text": "<at>Kallen (Stadtfeld) Kozuki</at>",
                "mentioned": {
                    "id": "<entraId>",
                    "name": "Kallen (Stadtfeld) Kozuki"
                }
            }
        ]
    }
}

Sample Code Language

No response

Sample Code

No response

Use the supplied Adaptive Card JSON to reproduce the mention rendering in Microsoft Teams message extensions, comparing web/desktop behavior with mobile. Done means the named mentions render correctly instead of showing the ... markup; the issue does not mention a source file or test to start from.