Help with the RingOut code sample in Getting Started

Using c#,  I followed the instructions for .net 2.1   and  Nuget package  RingCentral,net 4.1.0

The sample code given by the website will not compile.

The error is on this line of code

           restClient.Authorize(JWT_TOKEN).Wait();

Error (active)    CS1503    Argument 1: cannot convert from 'string' to 'RingCentral.GetTokenRequest'    RingDemo    C:\Users\joels\source\repos\RingDemo\RingDemo\Pages\Contact.cshtml.cs    39        
 

Please try this sample code

https://developers.ringcentral.com/guide/voice/ringout#c#

That worked,  

The problem was that I followed the instructions for creating a new Visual Studio project which say to use .NET 2.1 and RingCentral 4.1.0.

I created a new project with .netcore 8 and it works.

Can you update the web page instruction which currently say this

Create a Visual Studio project

• Choose Console Application .Net Core -> App
• Select Target Framework .NET Core 2.1
• Enter project name "Call_Ringout"
• Add NuGet package RingCentral.Net (4.1.0) SDK

It should work with Core 2.1 and above. At least 2.1 is what I am using. I think the new SDK does not like this way of calling asynchronous function.

restClient.Authorize(JWT_TOKEN).Wait();

Function is now Task and called differently.

await restClient.Authorize("RC_USER_JWT");
await call_ringout();

Failed to run the sample app -  Invalid client application: [VwDJcurad8XbFzWTpNwOas]. Would you please take a look?

Trying to create an app using C# to make first call with the following client ID (client secret and jwt not shown here).

        static String SERVER_URL = "https://platform.ringcentral.com";
        static String CLIENT_ID = "VwDJcurad8XbFzWTpNwOas";

Got the error.

Unhandled exception. System.AggregateException: One or more errors occurred. (One or more errors occurred. (Response:
StatusCode: 401, ReasonPhrase: 'Unauthorized', Version: 1.1, Content: System.Net.Http.HttpConnectionResponseContent, Headers:
{
  Date: Fri, 24 Apr 2026 15:00:31 GMT
  Connection: keep-alive
  Server: cloudflare
  Vary: Accept-Encoding
  Vary: Origin
  Vary: Access-Control-Request-Method
  Vary: Access-Control-Request-Headers
  WWW-Authenticate: Basic realm="RingCentral REST API", error="invalid_client", error_description="Invalid client application: [VwDJcurad8XbFzWTpNwOas]"
  RCRequestId: 568dc7c4-3fee-11f1-8f11-0050568d5bb1
  Pragma: no-cache
  Cache-Control: no-store
  AceRoutingKey: iad41-c01-ace01-69d5b684ff-8x9ds_10.120.173.247
  RoutingKey: SJC01P02
  cf-cache-status: DYNAMIC
  Set-Cookie: __cf_bm=yGTNzItmf81MyFyRH6zetDMYDsxrmWcmJ7W5iCCu3Wk-1777042831.1904476-1.0.1.1-jbF33VeqDOn8oJZhdk2hXoY5RM4TOBT4tY5hvRHnQQGuc.r9QXmEHxCluWGYbQZbCqBfvZf9.m1xCpbMyfhWFLZLEl_LdWi1_BLdTUjsk3OixaMNRKpx89PMCOFG36hy; HttpOnly; Secure; Path=/; Domain=platform.ringcentral.com; Expires=Fri, 24 Apr 2026 15:30:31 GMT
  Set-Cookie: _cfuvid=UyyT0Jnk6dEojI4DZyeJaBluddUqIGogVpmF2n6gO7I-1777042831.1904476-1.0.1.1-_Oez8ZmmrVnAr30XjF0VMco8jXVl970pVedhXllhCec; HttpOnly; SameSite=None; Secure; Path=/; Domain=platform.ringcentral.com
  CF-RAY: 9f15fa5ee8333a83-MIA
  Content-Type: application/json
  Content-Length: 355
  Content-Language: en
}
Content: {
  "error" : "invalid_client",
  "error_description" : "Invalid client application: [VwDJcurad8XbFzWTpNwOas]",
  "errors" : [ {
    "errorCode" : "OAU-153",
    "message" : "Invalid client application: [VwDJcurad8XbFzWTpNwOas]",
    "parameters" : [ {
      "parameterName" : "client_id",
      "parameterValue" : "VwDJcurad8XbFzWTpNwOas"
    } ]
  } ]
}

Request:
Method: POST, RequestUri: 'https://platform.ringcentral.com/restapi/oauth/token', Version: 1.1, Content: System.Net.Http.FormUrlEncodedContent, Headers:
{
  X-User-Agent: Unknown/0.0.1 RingCentral.Net/6.5.0
  Authorization: Basic VndESmN1cmFkOFhiRnpXVHBOd09hczphN1NBNllpWGRMcWJsa2Q1OVlqRTFrM1NKSk42Z29PMWJkZHBUYXMxS3FxYQ==
  Content-Type: application/x-www-form-urlencoded
  Content-Length: 794
}

This app client id “VwDJcurad8XbFzWTpNwOas”  (app name “Demonstration App”) has been suspended. I don’t know the reason why it was suspended. But that was the reason in your case.

You can login the RingCentral developers portal to create a new app for your account and test.