如何解决错误 AADSTS7000218：请求正文必须包含以下参数：“client_secret”或“client_assertion”

这就是我编写代码并尝试获取输出的方式。

请求正文必须包含以下参数：client_secret or client_assertion

 static async Task<AuthenticationResult> getAccessToken()
 {
     string hardcodedUsername = "";
     string hardcodedPassword = "";
     string tenantName = "projectwidgets.com";
     string authString = "https://login.microsoftonline.com/" + tenantName;
     AuthenticationContext authenticationContext = new AuthenticationContext(authString, false);
     //Config for OAuth client credentials
     string clientId = "as";
     string key = "kk";
     string authority = String.Format(CultureInfo.InvariantCulture, aadInstance, tenantName);
     var authContext = new AuthenticationContext(authority);
     AuthenticationResult result = null;
     try
     {
         result = await authContext.AcquireTokenAsync("https://pwsnapitazure.azurewebsites.net", clientId, new UserPasswordCredential(hardcodedUsername, hardcodedPassword));
     }
     catch (Exception ex)
     {
          Console.WriteLine(ex.StackTrace);
          System.Diagnostics.Debug.WriteLine(ex.Message);
     }                        
     return result;
 }

正如蔚蓝应用程序注册 UI 已从旧版身份验证更改，您将需要启用名为“将应用程序视为公共客户端”的附加设置。在下面默认客户端类型，将此设置设置为Yes:

In the Manifest您也可以通过设置来控制：

"allowPublicClient": true

2022 年更新：

用户界面名称更改为Allow public client flows