Microsoft Teams bot - debug link unfurling

Question

I'm trying to implement pretty simple teams bot but constantly facing an issues with unpredictable behavior. E.g. documentation clearly says that Teams applies Adaptive card as link unfurling response but when I'm sending pretty simple response like:

var card = new AdaptiveCard(new AdaptiveSchemaVersion(1, 0));
card.Body.Add(new AdaptiveTextBlock { Text = "Title", Size = AdaptiveTextSize.ExtraLarge });
var attachment = new MessagingExtensionAttachment { ContentType = AdaptiveCard.ContentType, Content = card };
var result = new MessagingExtensionResult(AttachmentLayoutTypes.List, "result", new[] { attachment });
return new MessagingExtensionResponse(result);

Teams doesn't render anything or follback to the default behavior. So the question is - are there any way to debug why it doesn't work?

mnkypete mnkypete · Accepted Answer · 2020-06-02T11:29:14

Had the same issue, the problem is this is not documented at all. You'll need to send a hero card (maybe something else works as well?) as preview and the adaptive card as full card:

return {
        composeExtension: {
            type: 'result',
            attachmentLayout: 'list',
            attachments: [{
                preview: CardFactory.heroCard("title", "description")
                ...CardFactory.adaptiveCard(card)
            }]
        }
    };

This will display an "expandable" hero card which resolves to the adaptive card.

Microsoft Teams bot - debug link unfurling

2 Answers