Environment version: .NET 9.0.0 (9.0.0)
AdaptiveCards version: AdaptiveCards, Version=2.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
AdaptiveCards.Templating version: AdaptiveCards.Templating, Version=2.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
Newtonsoft.Json version: Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed

{
  "type": "AdaptiveCard",
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.4",
  "body": [
    {
      "type": "TextBlock",
      "text": "${formatDateTime(AdditionalData['DUE-DATE'], 'd.M.yyyy')}",
      "wrap": true
    }
  ]
}
read template: AdaptiveCards.Templating.AdaptiveCardTemplate.  cardJson:
{"type":"AdaptiveCard","$schema":"http://adaptivecards.io/schemas/adaptive-card.json","version":"1.4","body":[{"type":"TextBlock","text":"10.9.2021","wrap":true}]}

AdaptiveCards.AdaptiveCardParseResult card created successfully with card.Card.ToJson():
{
  "type": "AdaptiveCard",
  "version": "1.4",
  "body": [
    {
      "type": "TextBlock",
      "text": "10.9.2021",
      "wrap": true
    }
  ]
}