Blazor Web App (.NET 9) InteractiveClient Mode: No Built-in Authentication/Authorization?

[dennis-jones]

I'm building a Blazor Web App using .NET 9 and targeting InteractiveClient render mode (InteractiveWebAssembly). My goal is to have a true SPA experience, where UI logic runs in the browser.

However, I've discovered that authentication and authorization features (such as AuthenticationStateProvider, , and integration with MSAL/Azure AD/Entra ID) are not supported out-of-the-box in InteractiveClient mode. The official documentation seems to confirm this, stating that authentication is only supported for InteractiveServer components.

Questions:

• Am I missing something? OR ...
• Is there an official or community-recommended workaround to enable authentication/authorization in InteractiveClient mode?
• Is exposing claims/roles via a server API endpoint and consuming them with HttpClient in Blazor components considered a best practice for showing/hiding UI elements?
• Are there plans for official support for authentication in InteractiveClient mode in future .NET releases?

Any links to up-to-date guides, samples, or discussions would be greatly appreciated.

Thanks for your help!