chatbot - What are Azure permissions for Azure Bot Service when using a RestAPI? - Stack Overflow

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I have a back-end flask server currently running locally and made available to azure using ngrok. I want to connect this back-end the Azure bot service. The back-end receives messages from the "Test in Web Chat" but get a 401 when I send the response. As far as I can figure I need to give the API the correct permissions.

It is a single tenant bot.

Code to generate the token for the response

    url = "/oauth2/v2.0/token"
    headers = {
        "Content-Type": "application/x-www-form-urlencoded"
    }
    data = {
        "grant_type": "client_credentials",
        "client_id": client_id,
        "client_secret": client_secret,
        "scope": "/.default"
    }

The decoded token

{
  "typ": "JWT",
  "alg": "RS256",
  "x5t": "imi0Y2z0dYKxBttAqK_Tt5hYBTk",
  "kid": "imi0Y2z0dYKxBttAqK_Tt5hYBTk"
}.{
  "aud": ";,
  "iss": "/",
  "iat": 1740236233,
  "nbf": 1740236233,
  "exp": 1740322933,
  "aio": "k2RgYGC/rfLecEbpExbj5edObn+xAAA=",
  "appid": "59db3818-3845-4cd7-93ef-0ec3efff7974",
  "appidacr": "1",
  "idp": "/",
  "idtyp": "app",
  "rh": "1.AW4AIJTU1pvz902h3NWak1hx20IzLY0pz1lJlXcODq-9FrxeAQBuAA.",
  "tid": "d6d49420-f39b-4df7-a1dc-d59a935871db",
  "uti": "-m34WPWqiUSVGPdqi39PAA",
  "ver": "1.0",
  "xms_idrel": "13 32"
}.[Signature]

Code for sending the response back to Azure bot.

    url = f"/{conversation_id}/activities"
    headers = {
        "Authorization": f"Bearer {token}",
        "Content-Type": "application/json"
    }
    json_block= {
        "type": "message",
        "text": "Hello from the bot!"
    }
    try:
        response = requests.post(url, headers=headers, json=json_block)

The error I get is '{"message":"Authorization has been denied for this request."}'

Here is the list of API permissions I gave my project in Microsoft Graph.

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