Allow Anonymous Access to Index Authorize Everything Else - asp.net-core

Question

I'm trying to authorize all pages by default and allow anonymous access to the index page. But when I run my app the user is required to login to view the index page. I'm using Azure AB B2C for authorization in a Blazor Server .NET 6 project. Here is my Program.cs file. Can someone explain what I'm doing wrong?
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.Identity.Web;
using Microsoft.Identity.Web.UI;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using BlazorB2C.Data;
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)
.AddMicrosoftIdentityWebApp(builder.Configuration.GetSection("AzureAdB2C"));
builder.Services.AddControllersWithViews()
.AddMicrosoftIdentityUI();
builder.Services.AddRazorPages(options =>
{
options.Conventions.AllowAnonymousToPage("/Index");
})
.AddMvcOptions(options => { })
.AddMicrosoftIdentityUI();
builder.Services.AddAuthorization(options =>
{
options.FallbackPolicy = options.DefaultPolicy;
});
builder.Services.AddServerSideBlazor()
.AddMicrosoftIdentityConsentHandler();
builder.Services.AddSingleton<WeatherForecastService>();
var app = builder.Build();
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();
app.MapBlazorHub();
app.MapFallbackToPage("/_Host");
app.Run();