Update send-email-net.md

Author: ddematheu2

articles/communication-services/quickstarts/email/includes/send-email-net.md

@@ -114,7 +114,7 @@ To authenticate using Azure Active Directory, install the Azure.Identity library
 dotnet add package Azure.Identity
 ```
 
- Open **Program.cs** in a text editor and replace the body of the `Main` method with code to initialize an `EmailClient` using `DefaultAzureCredential`. The Azure Identity SDK reads values from three environment variables at runtime to authenticate the application. Learn how to [create an Azure Active Directory Registered Application and set the environment variables](../../identity/service-principal-from-cli.md).
+ Open **Program.cs** in a text editor and replace the body of the `Main` method with code to initialize an `EmailClient` using `DefaultAzureCredential`. The Azure Identity SDK reads values from three environment variables at runtime to authenticate the application. Learn how to [create an Azure Active Directory Registered Application and set the environment variables](../../identity/service-principal.md?pivots=platform-azcli).
 
 ```csharp
 // This code demonstrates how to authenticate to your Communication Service resource using