How to Resolve IDX10501 Errors in a B2C Microsoft.Identity.Web Application

Consider the situation where you are developing an ASP.NET Core application that needs to support Azure B2C. Following the official Microsoft Document, you implement the Microsoft.Identity.Web library and three built-in User Flows. All is working well, but you also need to implement a Custom Policy. You find the following documentation which shows how to make a request with the B2C policy specified: https://learn.microsoft.com/en-us/azure/active-directory-b2c/enable-authentication-web-application-options#pass-the-azure-ad-b2c-policy-id You try to implement this guidance. Everything…

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