Blazor WebAssembly - Prevent Access for Unauthorized Users - blazor-webassembly

Question

I've got a Blazor webassembly app. It's part of an ASP.NET core website which has Cookie Authentication. You can login by visiting /login which is implemented as a .net core razor page.
services.AddRazorPages()
//.AddMvcOptions(options => options.Filters.Add(new AuthorizeFilter()))
.AddRazorPagesOptions(options =>
{
options.Conventions.AllowAnonymousToPage("/Login");
options.Conventions.AuthorizeFolder("/");
options.Conventions.AuthorizePage("/Logout");
options.Conventions.AllowAnonymousToPage("/Login");
});
services.AddAuthentication(options =>
{
options.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
options.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
}).AddCookie(options =>
{
options.LoginPath = "/Login";
// true by default
options.SlidingExpiration = true;
// 14 days by default
options.ExpireTimeSpan = TimeSpan.FromDays(20);
});
When the user isn't logged in, it's still possible to visit any route in the Blazor WebAssembly app. All the .net core Views are (correctly) inaccessible.
Where do I configure the WebAssembly part so that it's inaccessible to a non-authenticated user?
NOTE, I don't want to implement OIDC authentication in the WebAssembly part of the app (described in the Microsoft documentation) - or to add any of the login/logout logic to the WebAssembly part, just to make all the routes exposed by the WebAssembly app inaccessible for a non-authenticated user.