HttpPost Action fails with BadRequest

Senior Member

We use the Incoming Webhook feature to send notifications from our application backend to our internal Teams channel in some situations that require employee intervention (This is not a question about some kind of public Teams integration). I'm trying to add actionable notifications to our Teams workflow by adding an HttpPost action to our messages:

    "@type": "MessageCard",
    "@context": "",
    "summary": "Manual Verification Required",
    "themeColor": "#2196F3",
    "text": "<message content here>",
    "title": "Manual Verification Required",
    "potentialAction": [
            "@type": "HttpPOST",
            "name": "Approve",
            "target": "",
            "body": "verification.approve"


The message arrives in teams properly:



Upon clicking the button though, immediately the following error message appears:

:warning: Failed to send:
There was a problem submitting your changes. Try again in a minute.

After scratching my head, I opened the Teams web app and checked the console:

POST;messageid=1615721159117/1615721159117/executeAction 400

2021-03-14T11:30:20.322Z [O365ActionPaneController.makeHttpPOSTRequestForConnector()] Http invoke failed: {
  "data": {
    "errorCode": "BadRequest"
  "status": 400,
  "config": {
    "method": "POST",
    "transformRequest": [
    "transformResponse": [
    "url": ";messageid=1615721159117/1615721159117/executeAction",
    "data": {
      "inputParameters": [],
      "actionId": "3c5b2184-bffb-4797-9bbd-03fe41e11a83",
      "potentialAction": "{\"@type\":\"HttpPOST\",\"@id\":\"3c5b2184-bffb-4797-9bbd-03fe41e11a83\",\"name\":\"Approve\",\"target\":\"\",\"headers\":[],\"body\":\"verification.approve\",\"bodyContentType\":\"\"}",
      "name": "action/connector",
      "integrationId": "8urpi87b0u",
      "meta": "\"{\\\"connectorSenderGuid\\\":\\\"203a1e2c-26cc-47ca-83ae-be98f960b6b2\\\",\\\"providerAccountUniqueId\\\":null,\\\"connectorConfigurationAlternateId\\\":\\\"8a43fac7aa1748688609de3602c9a4c5\\\"}\"",
      "clientInfo": {
        "locale": "en-us",
        "country": "us",
        "platform": "Web",
        "clientVersion": "1415/"
    "headers": {
      "X-Skypetoken": "pii",
      "Authorization": "pii",
      "Accept": "application, text/plain, */*",
      "Content-Type": "application;charset=utf-8",
      "X-RingOverride": "general",
      "x-ms-scenario-id": "620",
      "x-ms-user-type": null,
      "x-ms-client-type": "web",
      "x-ms-client-env": "pckgsvc-prod-c1-euno-02",
      "x-ms-client-version": "1415/",
      "x-ms-session-id": "694afe93-2218-14ab-fd16-d46edaf9fcc5"
    "counter": "ext_actionable_card_http_post",
    "geoRoutingLookupDuration": 0.014999997802078724,
    "decrementNetworkRequests": null,
    "hostName": "",
    "requestCreationDuration": 0.09000004455447197,
    "requestStartTime": 3355762.155000033,
    "responseStartTime": 3356549.715000001,
    "requestDuration": 787.5649999482557
  "statusText": ""

So the only valuable information returned from the server seems to be the response {"errorCode":"BadRequest"}. That's a little thin.

I tried different variations of the body property - with quotes, without, with a content type, empty - no change.

What do I have to do to get message actions working?

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