Unable to Post a Message to Teams Channel with Graph API Client + C#

Question

Hi,

We are trying to post a message to teams channel, with Channel.SendMessage delegated permissions.

And here is the code snippet.

var options = new OnBehalfOfCredentialOptions

{

 AuthorityHost = AzureAuthorityHosts.AzurePublicCloud,
``` };

 var oboToken =""

 var onBehalfOfCredential = new OnBehalfOfCredential(

tenantId, clientId, clientSecret, oboToken, options);

 var requestBody = new ChatMessage

 {

Body = new ItemBody

{

 ContentType = BodyType.Html,

 Content = teamsCardData,
``` },
``` };

 var result = await graphClient.Teams[{ teamId}].Channels[{channelId}].Messages.PostAsync(requestBody);