How to tag an individual with the help of teams webhook?

I am trying to notify the test failures via teams channel.So whenever a test fails, a notification will be sent to a teams channel with the help of teams incoming webhooks.
notification snippet

Along with the above details, I would like to tag people who are responsible for the tests.

Below is the data I am sending. But instead of mention, plain text is getting published.
Data passed for ID: email ID [“[email protected]”]
Data passed for name: not sure what has to be passed for this parameter [“Hu, Xhan”]

{
            "@type": "MessageCard",
            "@context": "http://schema.org/extensions",
            "themeColor": "0076D7",
            "summary": "e2e Failed test",
            "sections": [{
                "activityTitle": "![TestImage](https://47a92947.ngrok.io/Content/Images/default.png)e2e Failed test",
                "activitySubtitle": "FT4 validation",
                "activityImage": "https://teamsnodesample.azurewebsites.net/static/img/image5.png",
                "facts": [{
                    "name": "Assigned to",
                    "value": "@Xhan"
                }, {
                    "name": "Script",
                    "value": "Script name"
                }, {
                    "name": "Scenario",
                    "value": "Scenario name"
                }, {
                    "name": "Step",
                    "value": "Test Step"
                }],
                "markdown": true
            }],
            "potentialAction": [{
                "@type": "ActionCard",
                   "name": "Result Link",
                   "actions": [{
                       "@type": "OpenUri",
                       "name": "Result Link",
                           "targets": [
                               { "os": "default", "uri": "https://dummylinkForNotifications" }
                           ]
                   }]
           }],
    "msteams": {
    "entities": [
      {
        "type": "mention",
        "text": "<at>Xhan</at>",
        "mentioned": {
          "id": "[email protected]",
          "name": "Hu, Xhan"
        }
      }
    ]
  }
}