Update Azure URL (#18153)

Author: mairaw

aspnetcore/azure/devops/tools-and-downloads.md

@@ -16,7 +16,7 @@ Azure has several interfaces for provisioning and managing resources, such as th
 
 The following subscriptions are required:
 
-* Azure — If you don't have an account, [get a free trial](https://azure.microsoft.com/free/).
+* Azure — If you don't have an account, [get a free trial](https://azure.microsoft.com/free/dotnet/).
 * Azure DevOps Services — your Azure DevOps subscription and organization is created in Chapter 4.
 * GitHub — If you don't have an account, [sign up for free](https://github.com/join).
 

aspnetcore/host-and-deploy/azure-apps/azure-continuous-deployment.md

@@ -19,7 +19,7 @@ This tutorial shows how to create an ASP.NET Core web app using Visual Studio an
 See also [Create your first pipeline with Azure Pipelines](/azure/devops/pipelines/get-started-yaml), which shows how to configure a continuous delivery (CD) workflow for [Azure App Service](/azure/app-service/app-service-web-overview) using Azure DevOps Services. Azure Pipelines (an Azure DevOps Services service) simplifies setting up a robust deployment pipeline to publish updates for apps hosted in Azure App Service. The pipeline can be configured from the Azure portal to build, run tests, deploy to a staging slot, and then deploy to production.
 
 > [!NOTE]
-> To complete this tutorial, a Microsoft Azure account is required. To obtain an account, [activate MSDN subscriber benefits](https://azure.microsoft.com/pricing/member-offers/credit-for-visual-studio-subscribers/?WT.mc_id=A261C142F) or [sign up for a free trial](https://azure.microsoft.com/free/?WT.mc_id=A261C142F).
+> To complete this tutorial, a Microsoft Azure account is required. To obtain an account, [activate MSDN subscriber benefits](https://azure.microsoft.com/pricing/member-offers/credit-for-visual-studio-subscribers/?WT.mc_id=A261C142F) or [sign up for a free trial](https://azure.microsoft.com/free/dotnet/?WT.mc_id=A261C142F).
 
 ## Prerequisites
 

aspnetcore/security/authentication/azure-ad-b2c.md

@@ -29,7 +29,7 @@ In this tutorial, learn how to:
 
 The following are required for this walkthrough:
 
-* [Microsoft Azure subscription](https://azure.microsoft.com/free/?ref=microsoft.com&utm_source=microsoft.com&utm_medium=docs&utm_campaign=visualstudio)
+* [Microsoft Azure subscription](https://azure.microsoft.com/free/dotnet/?ref=microsoft.com&utm_source=microsoft.com&utm_medium=docs&utm_campaign=visualstudio)
 * [Visual Studio 2019](https://visualstudio.microsoft.com/downloads/?utm_medium=microsoft&utm_source=docs.microsoft.com&utm_campaign=inline+link&utm_content=download+vs2019)
 
 ## Create the Azure Active Directory B2C tenant
@@ -157,4 +157,4 @@ Now that the ASP.NET Core app is configured to use Azure AD B2C for authenticati
 * Configure additional identity providers, such as [Microsoft](/azure/active-directory-b2c/active-directory-b2c-setup-msa-app), [Facebook](/azure/active-directory-b2c/active-directory-b2c-setup-fb-app), [Google](/azure/active-directory-b2c/active-directory-b2c-setup-goog-app), [Amazon](/azure/active-directory-b2c/active-directory-b2c-setup-amzn-app), [Twitter](/azure/active-directory-b2c/active-directory-b2c-setup-twitter-app), and others.
 * [Use the Azure AD Graph API](/azure/active-directory-b2c/active-directory-b2c-devquickstarts-graph-dotnet) to retrieve additional user information, such as group membership, from the Azure AD B2C tenant.
 * [Secure an ASP.NET Core web API using Azure AD B2C](https://azure.microsoft.com/resources/samples/active-directory-b2c-dotnetcore-webapi/).
-* [Call a .NET web API from a .NET web app using Azure AD B2C](/azure/active-directory-b2c/active-directory-b2c-devquickstarts-web-api-dotnet).
+* [Tutorial: Grant access to an ASP.NET web API using Azure Active Directory B2C](/azure/active-directory-b2c/tutorial-web-api-dotnet).