[Bug]: Adaptive cards not showing contents in iOS Teams app

[nikolayarhangelov]

Bug Description

I have a chat with a Teams bot, which renders adaptive cards.
Viewing the chat in Teams Desktop (and Web) shows the adaptive card contents.
Viewing the same chat in Teams iOS shows a blank bubble with no adaptive card contents.

Steps to Reproduce

App Versions

• Desktop - 25306.805.4102.7211, macOS Tahoe 26.2
• Mobile - 7.22.2, iOS 26.2

Packages

"@microsoft/teams.ai": "^2.0.5",
"@microsoft/teams.apps": "^2.0.5",
"@microsoft/teams.common": "^2.0.5",
"@microsoft/teams.openai": "^2.0.5"

Card Code

    await send(
      new AdaptiveCard(
        new TextBlock('Enter Time').withStyle('heading'),
        new DateInput()
          .withId('date')
          .withValue(getDateString(new Date()))
          .withIsRequired(true)
          .withLabel('Date')
          .withPlaceholder('Select a date')
          .withErrorMessage('Date is required'),
        new ChoiceSetInput()
          .withId('taskId')
          .withChoices(...cardTasks)
          .withValue(parameters.taskId || '')
          .withIsRequired(true)
          .withLabel('Task')
          .withErrorMessage('Task is required'),
        new NumberInput()
          .withId('durationMinutes')
          .withValue(cardDurationMinutes)
          .withMin(0)
          .withIsRequired(true)
          .withLabel('Time (minutes)')
          .withPlaceholder('Enter duration in minutes')
          .withErrorMessage('Time is required'),
        new TextInput()
          .withId('comment')
          .withValue(parameters.comment || '')
          .withMaxLength(250)
          .withIsMultiline(true)
          .withIsRequired(true)
          .withLabel('Comment')
          .withPlaceholder('Write a short comment')
          .withErrorMessage('Comment is required'),
        new ActionSet(
          new ExecuteAction()
            .withTitle('Submit')
            .withStyle('positive')
            .withVerb('enter_time_submit')
            .withAssociatedInputs('auto'),
          new ExecuteAction().withTitle('Cancel').withVerb('cancel')
        )
      )
    );

Expected Behavior

The adaptive card contents should be visible in the chat when viewed in Teams Desktop as well as Teams iOS.

Teams Desktop

Actual Behavior

Case 1

1. Open Teams Desktop and message the bot to trigger the adaptive card.
2. The adaptive card is shown with visible inputs and contents.
3. Open the same chat on Teams iOS.
4. The adaptive card is blank. The empty bubble in the red square is the card.

Case 2

1. Open the Teams iOS app.
2. Message the bot to trigger the adaptive card.
3. The adaptive card is blank.
4. Open the same chat on Teams Desktop or Web.
5. The adaptive card has contents and inputs.

Teams iOS

SDK Version

2.0.5

Node.js Version

22.20.0

Additional Context

This bot was migrated from the older Teams AI SDK. The same card contents and inputs used to show correctly in Teams iOS.
Considering this an SDK bug, instead of an iOS app bug, since the same card contents were showing with the old SDK on iOS.

Old Packages

"@microsoft/teams-ai": "^1.7.4",
"adaptivecards-templating": "^2.3.1",
"botbuilder": "^4.23.2",

Old Adaptive Card Template

{
  "type": "AdaptiveCard",
  "$schema": "https://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.5",
  "actions": [
    {
      "type": "Action.Submit",
      "title": "Submit",
      "iconUrl": "icon:Checkmark",
      "data": {
        "verb": "onEnterTimeSubmit"
      }
    },
    {
      "type": "Action.Submit",
      "title": "Cancel",
      "iconUrl": "icon:Dismiss",
      "mode": "secondary",
      "data": {
        "verb": "onCancel"
      },
      "associatedInputs": "none"
    }
  ],
  "body": [
    {
      "type": "TextBlock",
      "text": "Enter Time",
      "wrap": true,
      "style": "heading"
    },
    {
      "type": "Input.Date",
      "label": "Date",
      "placeholder": "Select a date",
      "isRequired": true,
      "id": "date",
      "value": "${date}",
      "errorMessage": "Date is required"
    },
    {
      "type": "Input.ChoiceSet",
      "label": "Task",
      "placeholder": "Select a task",
      "isRequired": true,
      "id": "taskId",
      "value": "${taskId}",
      "errorMessage": "Task is required",
      "choices": [
        {
          "$data": "${tasks}",
          "title": "${title}",
          "value": "${value}"
        }
      ]
    },
    {
      "type": "Input.Number",
      "label": "Time (minutes)",
      "placeholder": "Enter time",
      "isRequired": true,
      "min": 0,
      "id": "durationMinutes",
      "value": "${durationMinutes}",
      "errorMessage": "Time is required"
    },
    {
      "type": "Input.Text",
      "label": "Comment",
      "placeholder": "Write a short comment",
      "isMultiline": true,
      "isRequired": true,
      "maxLength": 250,
      "id": "comment",
      "value": "${comment}",
      "errorMessage": "Comment is required"
    }
  ]
}

[nikolayarhangelov]

@heyitsaamir @MehakBindra any thoughts or suggestions on this?

[corinagum]

@nikolayarhangelov I am investigating this today.

[corinagum]

@nikolayarhangelov I've confirmed that this issue is due to the Adaptive Card not having a version applied. I am not 100% positive, but it's possible that on iOS there some kind of version validation that happens against the Adaptive Cards spec, and the Teams SDK not specifying a version causes a failure to render.

I am creating a PR for the fixes, but in the meantime, feel free to modify your card code with .withVersion('1.5') and it will render in iOS as expected. :)