AspNetCore.Identity.MongoDbCore | MongoDb UserStore and RoleStore adapter | Identity Management library

I'm trying to get the AspNetCore Authorization to work with a MongoDB as store. The application is based on Razorpages and at the moment I'm strugling on getting a simple redirect to work.

Im using the AspNetCore.Identity.MongoDbCore adapter.

the login seems to be successfull but the redirect doesn't work. does any one know where Im going wrong here?

'XXXX' is a name i don't want to share with the internet :) just to clarify

this is the output I'm getting:

I'm trying to set up an authentication and authorization section for a frontend web application I have. The application is set up as an ASP.NET Core Razor Page Application. (.NET Core 3.0); I also set it up with authentication pre-installed with the following command: dotnet new razor -au Individual.

With this, I'm trying to set up an OpenID Authentication External Login from an external service (Identity Server) I have. The problem lies with displaying the final user on the frontend (or if I'm doing this entirely wrong... - I've spent a questionable amount of time on this topic, and I couldn't find anything other than old questions, or content on how you could previously do it with MVC Apps) - I was also able to find the external user stored in the local database and can tell through code successfully signed in from the external Identity Server. (explained later)

This is my first project with a major authentication/authorization section - I apologize in advance If anything stupid jumps out. I'd love to find out what went wrong. Here goes!

Startup.cs