Azure.Analytics.Purview.Workflows README.md Fix (Azure#48790)

Author: mcgallan

sdk/purview/Azure.Analytics.Purview.Workflows/README.md

@@ -24,7 +24,7 @@ You must have an [Azure subscription][azure_subscription] and a [Purview resourc
 
 ### Authenticate the client
 
-Since the Workflow service uses an Azure Active Directory (AAD) bearer token for authentication and identification, an email address should be encoded into the token to allow for notification when using Workflow. It is recommended that the [Azure Identity][azure_identity] library be used  with a the [UsernamePasswordCredential][username_password_credential]. Before using the [Azure Identity][azure_identity] library with Workflow, [an application][app_registration] should be registered and used for the clientId passed to the [UsernamePasswordCredential][username_password_credential].
+Since the Workflow service uses an Azure Active Directory (AAD) bearer token for authentication and identification, an email address should be encoded into the token to allow for notification when using Workflow. It is recommended that the [Azure Identity][azure_identity] library be used  with a the [DefaultAzureCredential][default_azure_credential]. Before using the [Azure Identity][azure_identity] library with Workflow, [an application][app_registration] should be registered and set the information obtained from the application, such as AZURE_CLIENT_ID, AZURE_TENANT_ID, and AZURE_CLIENT_SECRET, as environment variables. Then use [DefaultAzureCredential][default_azure_credential] for authentication. For more authentication details, refer to [MFA][multifactor_authentication].
 
 ```C# Snippet:Azure_Analytics_Purview_Workflows_CreateClient
 Uri endpoint = new Uri(Environment.GetEnvironmentVariable("WORKFLOW_ENDPOINT"));
@@ -104,7 +104,8 @@ This project has adopted the [Microsoft Open Source Code of Conduct][code_of_con
 [purview_resource]: https://learn.microsoft.com/azure/purview/create-catalog-portal
 [azure_identity]: https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/identity/Azure.Identity/README.md
 [app_registration]: https://learn.microsoft.com/azure/active-directory/develop/quickstart-register-app
-[username_password_credential]: https://learn.microsoft.com/dotnet/api/azure.identity.usernamepasswordcredential?view=azure-dotnet
+[default_azure_credential]: https://learn.microsoft.com/dotnet/api/azure.identity.defaultazurecredential?view=azure-dotnet
+[multifactor_authentication]:https://learn.microsoft.com/entra/identity/authentication/concept-mandatory-multifactor-authentication?tabs=dotnet#client-libraries
 [protocol_client_quickstart]: https://aka.ms/azsdk/net/protocol/quickstart
 [cla]: https://cla.microsoft.com
 [code_of_conduct]: https://opensource.microsoft.com/codeofconduct/