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Using Post to a channel when a webhook request is received workflow for notifications to teams channel.

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Posted on by Shankar18

We are migrating from O365 connectors to Workflows - while testing posts to workflows from python script i am seeing this issue.

ExpressionEvaluationFailed. The execution of template action 'Send_each_adaptive_card' failed: the result of the evaluation of 'foreach' expression '@triggerOutputs()?['body']?['attachments']' is of type 'Null'. The result must be a valid array.

Please let me know how to fix this.

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Using flows

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georgel 8 on at

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I think that you will need to use the right format for adaptive card, such as the following in Python:

json = { "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":"Some error occurred", "color":"warning", "wrap":True } ] } } ] } requests.post(url, json=json, headers = {'Content-Type': 'application/json'})

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Sayan 818 Super User 2025 Season 2 on at

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Hii @Shankar18
The error message indicates that the attachments field in the webhook request's body is null or not an array, causing the foreach loop to fail.

Solution:
Ensure that the webhook request from the Python script includes the attachments field in the body.
Verify the structure of the webhook request payload.
Before the foreach loop, add a condition to check if attachments is not null and is an array.
You can use a condition or initialize a variable with a default value if attachments is missing.

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If my suggestion helped you, please give it a Thumbs up 👍 and Mark it as a Solution 🎉 .
Sayan Patra
RPA Developer

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minhhoangn 40 on at

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Hello everybody,
I am also having problems converting Office connector to Workflow,
Currently I need to send messages via MS Teams using webhooks with commands
// on Windows
curl.exe -H "Content-Type:application/json" -d "{'text':'Hello World'}" <YOUR WEBHOOK URL>
When I switched, I couldn't do this anymore.
Workflow can only run step "When a Teams webhook request is received"
In the return of the webhook url
I have tried many card adapters searching on google but they don't work. My request is simply to send a plaintext message to the Teams channel. If possible, I would like to send an alert from Zabbix to the Teams channel. Previously, the webhook worked fine, but when I switched the workflow, I didn't know how to configure it
Thank in advanced

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minhhoangn 40 on at

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It worked, here is my powershell script
# Định nghĩa URL của HTTP POST
$webhookUrl = "URL"
# Định nghĩa nội dung của adaptive card
$adaptiveCardPayload = @{
type = "message"
attachments = @(
@{
contentType = "application/vnd.microsoft.card.adaptive"
content = @{
"$schema" = "http://adaptivecards.io/schemas/adaptive-card.json"
type = "AdaptiveCard"
version = "1.2"
body = @(
@{
type = "TextBlock"
text = "Some error occurred"
color = "warning"
wrap = $true
}
)
}
}
)
} | ConvertTo-Json -Depth 10
# Định nghĩa headers
$headers = @{
"Content-Type" = "application/json"
}
# Gửi yêu cầu HTTP POST
Invoke-RestMethod -Uri $webhookUrl -Method POST -Body $adaptiveCardPayload -Headers $headers

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brani145 5 on at

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Hi I am also having difficulty migrating O365 connectors to workflow. Previously I am using pymsteams library in python to send a message to my teams channel. It is HTML report. But I can't get the same result using workflows.

For Example, my report looks like this with webhooks in the teams channel:
I am using this code in Python for current webhooks.
import pymsteams
import sys

mymessage = pymsteams.connectorcard("Webhook_URL")
with open(sys.argv[1], 'r') as file:
mymessage.text(file.read())
mymessage.send()

How can I achieve the same result using workflow? I have the workflow URL generated. Does the adaptive card have this capability?

I took the reference from one of the above reply and used this code:
import pymsteams
import sys
from bs4 import BeautifulSoup

# Read the HTML file path from the command line
html_file_path = sys.argv[1]

# Read the HTML file
with open(html_file_path, 'r') as file:
html_content = file.read()

# Use BeautifulSoup to strip HTML tags and get plain text
soup = BeautifulSoup(html_content, 'html.parser')
text_content = soup.get_text()

# Create the adaptive card payload
adaptive_card_payload = {
"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": text_content,
"wrap": True
}
]
}
}
]
}

# connector card object with workflow URL
workflow_url = "https://prod2..."
mymessage = pymsteams.connectorcard(workflow_url)

# Add the adaptive card payload to the message
mymessage.payload = adaptive_card_payload

# Send the message
mymessage.send()

But it sends the file in plain text. How can I achieve the same results? Any help will be appreciated

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minhhoangn 40 on at

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yes, You probably just used an adaptercard like my comment.
Sorry, I haven't found html support at the moment. I'm also having difficulty using Zabbix alerts via MS Teams workflow as it doesn't support html.
Hope someone will help us.

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Ryan_Tien 12 on at

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Hi MinhHoangn , thanks for Your script ! , let ChatGPT help you make script Zabbix alerts via MS Teams, copy paste your script to chat GPT then type " translate this script powershell to script bash linux"

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minhhoangn 40 on at

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Thank you, But It's not as simple as translating from powershell to shell. Because it is related to many other things.

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Ryan_Tien 12 on at

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#!/bin/bash webhookUrl="https://prod2-08.south.............." adaptiveCardPayload=$(cat <<EOF { "type": "message", "attachments": [ { "contentType": "application/vnd.microsoft.card.adaptive", "content": { "\$schema": "http://adaptivecards.io/schemas/adaptive-card.json", "type": "AdaptiveCard", "version": "1.2", "body": [ { "type": "TextBlock", "text": "Test", "color": "warning", "wrap": true } ] } } ] } EOF ) headers="Content-Type: application/json" # Send HTTP POST request curl -X POST -H "$headers" -d "$adaptiveCardPayload" "$webhookUrl"
hi @minhhoangn , this script make by chatGPT when i give your script to it translate 😃, combine with link : https://www.youtube.com/watch?v=zZSXEvjpfbY you can make Zabbix alerts via MS Teams

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minhhoangn 40 on at

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Perfect, Thank you so much. i can try do it.

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