Prerendering Blazor WASM .NET 5 app with authentication throws error

[ChristianWeyer]

I have a Blazor WASM application using OIDC authentication (based on this https://docs.microsoft.com/en-us/aspnet/core/blazor/security/webassembly/standalone-with-authentication-library?view=aspnetcore-5.0&tabs=visual-studio). This works fine.

Now, when I add WASM prerendering (based on this https://docs.microsoft.com/en-us/aspnet/core/blazor/security/webassembly/additional-scenarios?view=aspnetcore-5.0#support-prerendering-with-authentication), then it no longer works. I get a strange behavior after the app loads and 404 errors. The redirect after the login then also hits a 404.
In fact, every route is giving a 404... hm...

Here is a small demo video:

This is the demo code:
https://github.com/thinktecture/blazor-webassembly-demo/tree/prerender

.cc @guardrex
dotnet/AspNetCore.Docs#20696

[guardrex]

I'll update the <app> to <div id="app"> on dotnet/AspNetCore.Docs#20698 and dotnet/AspNetCore.Docs#20737 PRs and then followup later with a new PR for anything else that we need to do for this scenario in 5.0 docs.

[ghost]

Thanks for contacting us.
We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[ghost]

Thanks for contacting us.
We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[SteveSandersonMS]

We're keen to do something useful for this in 7.0 but it's too late to address in 6.0 now we're in the RC phase unfortunately.

[mkArtakMSFT]

Closing this in favor of #27592 as a dupe