What access security architecture should be recommended for an Azure App Service web app that requires user approval for access?

The recommendation of using an access package in Identity Governance is particularly suitable for a scenario that requires user approval for access because it allows for the creation and management of access requests in a controlled manner. Access packages allow you to bundle resources, applications, and access permissions, enabling organizations to handle how users request and obtain access to specific resources within Azure.

By implementing access packages, you can configure workflows for approval, ensuring that any access requests to the Azure App Service web app get the necessary approvals before being granted. This process not only enhances security by ensuring that approvals are handled appropriately but also simplifies the user experience by allowing self-service access requests that are moderated through the approval process.

In contrast, alternatives such as Azure AD Application Proxy are primarily focused on providing secure remote access to on-premises applications and may not inherently facilitate user approval workflows. Azure Front Door Service deals more with application delivery and scalability rather than access management, while Active Directory Domain Services is traditionally used for on-premises directory services and doesn't specifically cater to user approval processes in cloud applications. Thus, an access package in Identity Governance is the most aligned with the requirement for user approval for access to a web app in Azure.