Microsoft Graph REST API v1.0: Can't expand image posted in Teams channel

Viktor Povazhuk 0 Reputation points

Services: Microsoft Graph REST API v1.0, python, Microsoft Teams for business.

Scenario: I used Microsoft Graph REST API v1.0 in python script to post image into Microsoft Teams private channel. The code snippet is attached.

Result: The image is posted. However, I can't expand it: when I click on image in the channel message, nothing happens. How can I fix this problem?


OS: Windows 10

Python version: 3.11.4

Troubleshooting efforts:

  1. Reviewed documentation page and confirmed that request destination url and body format haven't updated.
  2. Tried to change resolution of image in attributes height and width in img tag.

Supporting materials:

  • Minimal reproducible example
import json
import os
import base64
import cv2
import requests

def get_token(client_id, client_secret, tenant_id, user_name, password):
    uri = f"{tenant_id}/oauth2/v2.0/token"
    headers = {'Content-Type': 'application/x-www-form-urlencoded'}
    body = {'tenant': tenant_id,
            'client_id': client_id,
            'grant_type': 'password',
            'username': user_name,
            'password': password,
            'client_secret': client_secret,
            'scope': ""

    r =, data=body, headers=headers)
    return r.json()

def send_image(self, img, token, team_id, channel_id):
    img_bytes = cv2.imencode('.png', img)[1]
    img_bytes = base64.b64encode(img_bytes).decode("utf-8")
    endpoint = f'{team_id}/channels/{channel_id}/messages'
    msg = {
        "body": {
            "contentType": "html",
            "content": f"<div><div>\n<div><span><img height=\"1080\" src=\"../hostedContents/1/$value\" width=\"1620\" style=\"vertical-align:bottom; width:1620; height:1080px\"></span>\n\n</div>\n\n\n</div></div>"
        "hostedContents": [
                "@microsoft.graph.temporaryId": "1",
                "contentBytes": img_bytes,
                "contentType": "image/png"

    rr =, json=msg,
                        headers={'Content-type': 'application/json',
                                'Authorization': token['token_type'] + ' ' + token['access_token']})

CLIENT_ID = os.getenv('CLIENT_ID')
TENANT_ID = os.getenv('TENANT_ID')
USER_NAME = os.getenv('USER_NAME')
PASSWORD = os.getenv('PASSWORD')
TEAM_ID = os.getenv('TEAM_ID')
CHANNEL_ID = os.getenv('CHANNEL_ID')

img = cv2.imread('frame_000000.png')

send_image(token, img, token, TEAM_ID, CHANNEL_ID)
  • Image


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