Sending Teams Message To Any User From A Specific User From PowerAutomate

POST /chats/{chat-id}/messages

In our case, as I said we will be using delegation permission so choose Delegated permission.

Search for tex "chat" in the search box and select the below permissions and Click on Add permissions button.

We should see below permission added, We would need to allow Grant admin consent to get token from passive mode as we are supposed to get token from Power Automate.

The next step is to create a client secret which will use later, click on Certificates and secrets from the left blade, Click on New Client Secret.

Provide a description and expiration date based on your preference and click on Add. Once it is added, we can see the secret value like below, we need to make sure to copy it somewhere at this point in time else it would mask later if we move away from this page.

The next step is to get a copy of client Id, from the left blade, click on Overview, and note the Client Id and Tenant Id as in the below screenshot.

Now we are ready with setup from the Azure AD side to call the Graph API and we have the required information which we will use in Power Automate.

Creating Power Automate

For the sake of simplicity, I will use manually triggered flow but you can do it based on your preference.

The first action was the one which we discussed before is to Create a Chat, enter the targeted user's email address to whom we need to send a message.

The next step here is to get a user access token, so for this, we will make a POST HTTP Request to the below URL,

https://login.microsoftonline.com/<tenantid>/oauth2/v2.0/token

Refer to the below screenshot for other configurations.

In header put,

Content-Type: application/x-www-form-urlencoded

In the body put below the URL, please make sure you are encoding secret the values if it contains any special characters.

client_id=<tenantid>&[email protected]&password=<enteryourpasswordhere>
&grant_type=password&client_secret@{encodeUriComponent('yourclientsecret')}
&scope=ChatMessage.Send%20Chat.ReadWrite

Next, add action Parse JSON to parse the output of the above action to extract access token, and then we can use in next action to pass to actual Graph API endpoint call.

Enter below JSON in the schema,

{
    "type": "object",
    "properties": {
        "token_type": {
            "type": "string"
        },
        "scope": {
            "type": "string"
        },
        "expires_in": {
            "type": "integer"
        },
        "ext_expires_in": {
            "type": "integer"
        },
        "access_token": {
            "type": "string"
        },
        "refresh_token": {
            "type": "string"
        }
    }
}

Parse JSON would look like below, Content would be a body object from previous Get Token output.

Now we can use Another HTTP Action to call the actual endpoint.

Enter endpoint as below where conversation id is dynamic.

https://graph.microsoft.com/v1.0/chats/@{outputs('Create_a_chat')?['body/id']}/messages

Add Authorization in Headers with access token parameter.

In the request, the body add below JSON,

{
 "body": {
 "content": "Hello Message from Power Automate "
 }
}

Please note that you can also send rich HTML messages with images or it can be an adaptive card also.

Save the flow. below is how whole flow would look like,

We have now created flow, to test run flow manually to see if the message is being sent. You should see below output in your teams(from the specific account which we used to get tokens).

Conclusion

In this article, we have explored the below concept.

• How to send private team chat messages (1:1) to any user from a specific account.
• Register an Azure AD APP to call Graph API using clientId and Secret.
• How to get a delegated token from Power Automate using grant type as password bypassing username and password.
• How to call Graph API from Power Automate using delegated permissions and bearer access tokens.