MS Teams & Excel Online connector. Processing of competitive responders

[Kris_tina]

I've created a flow consisting of three steps:

1. Post an Adaptive card to a Teams channel and wait for response;
2. Get the responder email and add it to table;
3. Post message to the responder from Flow bot.

 There is a problem with Post an Adaptive card to a Teams channel and wait for response action. 

I'm using my own adaptive card which contains Action.Submit button for the action.

JSON for the card:

{
    "type": "AdaptiveCard",
    "body": [
        {
            "type": "TextBlock",
            "weight": "Bolder",
            "text": "Hello, everyone!",
            "color": "Accent",
            "size": "Large"
        },
        {
            "type": "ColumnSet",
            "columns": [
                {
                    "type": "Column",
                    "items": [
                        {
                            "type": "TextBlock",
                            "weight": "Bolder",
                            "text": "Text Text Text",
                            "wrap": true
                        }
                    ],
                    "width": "stretch"
                }
            ]
        },
        {
            "type": "TextBlock",
            "text": "If you want to review the text, please click  'Take it' in the message.",
            "wrap": true
        },
        {
            "type": "ActionSet",
            "actions": [
                {
                    "type": "Action.Submit",
                    "title": "Take It",
                    "id": "ac_submit"
                }
            ]
        }
    ],
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.2"
}

When two users (A and B for example) click on the button simultaneously, then the following issues happen:

• The card updates and displays User A as a responder.
• The flow continues for User B. Email of User B is added to a table and Flow sends a message to User B.

I've reviewed the run history. I see that the responder of the first action is User B and Recipient in action 3 is a User B too.

But the updated card in the channel displays User A as a responder.

Is it a real bug of the development? or Is there an error in building my flow?