Display number in adaptive card
This is a limitation of the preview (known as Type Coercion) that we hope to address before release. As another workaround you can include a space after the binding expression which will force it into a string. See the below example, notice the space after {data}
{
"type": "AdaptiveCard",
"version": "1.0",
"body": [
{
"type": "TextBlock",
"text": "{data} "
}
],
"$schema": "http://adaptivecards.io/schemas/adaptive-card.json"
}