What recommendation should be made to allow fabrikam.com users to authenticate to an Azure App Service web app using Azure AD?

To enable fabrikam.com users to authenticate to an Azure App Service web app using Azure Active Directory (Azure AD), leveraging Azure AD entitlement management is a suitable recommendation.

Azure AD entitlement management is a feature that allows organizations to manage access to applications and resources for both internal and external users effectively. Through this management approach, organizations can define access policies, govern user assignments, and ensure that external users have the necessary permissions to authenticate and access resources securely. This is particularly valuable in scenarios where external collaboration is necessary, such as allowing users from fabrikam.com to access a web app developed for them.

The other options do not directly address the requirement for fabrikam.com users to authenticate with the Azure App Service. Provisioning services focus on user creation and management, while pass-through authentication and updating the sign-in endpoint pertains more to the authentication flow rather than managing user access specifically. Configuring Azure AD join is relevant for devices rather than individual user authentication for an application. Thus, focusing on entitlement management provides a holistic approach to handling access and authentication that aligns with Azure’s capabilities related to user management.