Azure B2C GetOwinContext().Authentication.Challenge creates wrong url with Question mark instead of And sign
I am using Azure B2C and I am using the project at https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-devquickstarts-webapp-dotnet as startup guide. I manage to run this sample fine by replacing the config entries with my client ID, tenant ID, etc. However when I try to add Azure B2C authentication to my current web app (Asp.NET MVC dot net 4.5) it behaves in a very weird way. When I press log in it redirects me to a slightly different url than it does in the working sample. It replaces the And sign after the policy with a question mark /authorize?p=b2c_1_signin**