Unable to reach app - Adaptive Cards

Prasad_Das-MSFT Here is a copy of the adaptive card. The Update Message is not an adaptive card itself just "@{variables('StrClientName')}'s @{variables('StrFormName')} was handled."

{
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "type": "AdaptiveCard",
    "version": "1.2",
    "body": [
        {
            "type": "TextBlock",
            "text": "A Form was Submitted",
            "id": "Title",
            "spacing": "Medium",
            "horizontalAlignment": "Center",
            "size": "ExtraLarge",
            "weight": "Bolder",
            "color": "Accent"
        },
        {
            "type": "TextBlock",
            "text": "Received at @{body('Convert_time_zone')}",
            "id": "acHeaderTagLine",
            "separator": true
        },
        {
            "type": "TextBlock",
            "weight": "Bolder",
            "size": "Large",
            "spacing": "None",
            "id": "acHeader",
            "text": "Information Below"
        },
        {
            "type": "TextBlock",
            "text": "@{outputs('Get_@mention_token_for_Type_1_Notifications')?['body/atMention']}",
            "wrap": true,
            "id": "txtMention"
        },
        {
            "type": "TextBlock",
            "text": "@{variables('StrClientName')} submitted the @{variables('StrFormName')}",
            "id": "acDetails",
            "wrap": true
        },
        {
            "type": "TextBlock",
            "text": "Has the associated task been complete?",
            "id": "acQuestion",
            "weight": "Bolder"
        },
        {
            "type": "ActionSet",
            "actions": [
                {
                    "type": "Action.Submit",
                    "id": "butSubmit",
                    "title": "Yes, I have completed any associated tasks."
                }
            ]
        }
    ]
}