Unable to post message to Microsoft teams channel using Graph API

Question

I am trying post message to Microsoft teams channel using Graph API but bot no luck.

First I got Bearer token by making below call.

curl --location --request POST 'https://login.microsoftonline.com/22109ccf-0021-48af-947a-11111111111/oauth2/v2.0/token' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--header 'Cookie: x-ms-gateway-slice=estsfd; stsservicecookie=estsfd; fpc=ApGgHx8qh5hBlL_RviIqR3XYPIX9AQAAADMMeNgOAAAA' \
--data-urlencode 'scope=https://graph.microsoft.com/.default' \
--data-urlencode 'client_id={client_id}' \
--data-urlencode 'client_secret={client_secret}' \
--data-urlencode 'grant_type=client_credentials' \
--data-urlencode 'code=' \
--data-urlencode 'redirect_uri=https://localhost:8080'

Using bearer token got in previous call to post message to teams channel. but receiving Unauthorized error , I have added below permissions

Teamwork.Migrate.All (App)

Content-type: application/json

{
  "body": {
    "content": "Hello World"
  }
}

I tried using explore https://developer.microsoft.com/en-us/graph/graph-explorer but getting MethodNotAllowed error.

Is it possible to post message to MS teams channel by using Graph API ?In documentation it says we can https://docs.microsoft.com/en-us/graph/api/channel-post-messages?view=graph-rest-1.0&tabs=http.

Shweta Shweta · Accepted Answer · 2021-07-08T09:10:29

Could you please check your token here and confirm if you see all the necessary permissions in it.

As per documentation, here is the list of permissions supported.

Please make sure, if you are using permission 'ChannelMessage.Send' it is obtained using delegated context token as Application context token is currently not supported.

Hope this helps. Thanks!

Unable to post message to Microsoft teams channel using Graph API

1 Answers