ASP.NET Core server-side and Blazor Web App

[saraghadyani]

Description

I am following the method in "ASP.NET Core server-side and Blazor Web App additional security scenarios" and implemented them in my blazor web app (server based). I get an exception

InvalidOperationException: No authentication handler is registered for the scheme 'OpenIdConnect'. The registered schemes are: MicrosoftOidc, Cookies. Did you forget to call AddAuthentication().AddSomeAuthHandler?

if instead of :

using Microsoft.AspNetCore.Authentication.OpenIdConnect;

...

app.MapRazorComponents().RequireAuthorization(
new AuthorizeAttribute
{
AuthenticationSchemes = OpenIdConnectDefaults.AuthenticationScheme
})
.AddInteractiveServerRenderMode();

I replace it with

app.MapRazorComponents()
.AddInteractiveServerRenderMode();

The web app runs without error, but going to login page in web app I get following error:

OpenIdConnectProtocolException: Message contains error: 'invalid_request', error_description: 'AADB2C90012: The scope 'openid profile offline_access' provided in request is not supported.
Correlation ID: df101545-3015-4419-a1f9-a3a535b1caf2
Timestamp: 2025-06-17 15:02:31Z
', error_uri: 'error_uri is null'.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/security/additional-scenarios?view=aspnetcore-9.0&source=docs

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/security/additional-scenarios.md

Document ID

85d1072a-59eb-7b01-2476-fa699ee03653

Platform Id

0bb44a31-eea5-7fdc-3d77-85dbf2f31315

Article author

@guardrex

Metadata

• ID: 85d1072a-59eb-7b01-2476-fa699ee03653
• PlatformId: 0bb44a31-eea5-7fdc-3d77-85dbf2f31315
• Service: aspnet-core
• Sub-service: blazor

Related Issues

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[guardrex]

Hello @saraghadyani ... I can't tell what you're doing from that report and why it's failing. For OIDC and Blazor Web Apps, we recommend using the sample app and article (or matching the sample app and article when upgrading/converting from Blazor Server) in ...

https://learn.microsoft.com/en-us/aspnet/core/blazor/security/blazor-web-app-with-oidc?view=aspnetcore-9.0&pivots=non-bff-pattern

Outside of that, you should consult with devs on a public support forum. We recommend...

• Stack Overflow (tag: blazor)
• ASP.NET Core Slack Team
• Blazor Gitter

If you want me to look at anything, I need ...

• The exact section(s) of the article that you're following.
• A minimal repro sample app put up in a public GitHub repository.
• A bit of time ... I'm OOF most of the next three weeks. I'll be back in July.