This blog focuses on implementing a delegated Microsoft On-Behalf-Of flow in ASP.NET Core for access token management.The solution uses Microsoft.Identity.Web to facilitate different flows and is straightforward to implement.It allows requesting delegated access tokens for a user and another application, enabling secure access to protected resources.Key components include secure token storage, robust handling of token expiration, and support for multi-instance deployments.The article details setting up a web UI application, an API, and another API implementing the On-Behalf-Of flow.Token management involves persistence, expiry, safe storage, and seamless operation post-restarts.The example code provided demonstrates acquiring and using access tokens for the applications involved.Different examples of Microsoft On-Behalf-Of flow integration with other services are also discussed in the article.Microsoft's recommended practices for secure, delegated token exchange using the On-Behalf-Of flow are highlighted.The article delves into various standards related to OAuth 2.0, JWT, and Microsoft identity platform for secure access.