Classic Teams webhooks don't work in group chats — you need Power Automate + Adaptive Cards

2026-02-25 (7m ago)4 views

#teams#microsoft#webhooks

I wanted to post a poll to a Teams group chat from a script. Turns out there are like four different ways to do this and most of them don't work for group chats!

what doesn't work

Classic Incoming Webhooks only work in channels. Not group chats. Dead end.

what works: Power Automate + Adaptive Cards

Power Automate Workflows replaced classic webhooks. You create a flow with the "When a Teams webhook request is received" trigger, point it at your group chat, and POST an Adaptive Card to the generated URL:

curl -X POST "{your-power-automate-webhook-url}" \
  -H "Content-Type: application/json" \
  -d '{
    "type": "message",
    "attachments": [{
      "contentType": "application/vnd.microsoft.card.adaptive",
      "content": {
        "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
        "type": "AdaptiveCard",
        "version": "1.2",
        "body": [
          { "type": "TextBlock", "text": "Poll question?", "wrap": true },
          {
            "type": "Input.ChoiceSet",
            "id": "pollAnswer",
            "style": "expanded",
            "choices": [
              { "title": "Option A", "value": "a" },
              { "title": "Option B", "value": "b" }
            ]
          }
        ],
        "actions": [{ "type": "Action.Submit", "title": "Vote" }]
      }
    }]
  }'

A 202 Accepted means it landed.

the catch with Action.Submit

Action.Submit has nowhere to send votes when the card comes from a webhook — they just go nowhere. To actually collect responses, I found you need to replace the submit button with Action.OpenUrl pointing at a Microsoft Forms poll. Forms handles collection, Teams handles delivery.

The Microsoft Graph API can post to group chats too, but it needs Azure AD app registration, OAuth, and delegated permissions. Way too much overhead for just posting a message.