Program.cs

using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.Identity.Web;
using Microsoft.Identity.Web.UI;
using MudBlazor.Services;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var initialScopes = builder.Configuration["DownstreamApi:Scopes"]?.Split(' ');

builder.Services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)
    .AddMicrosoftIdentityWebApp(builder.Configuration.GetSection("AzureAd"))
        .EnableTokenAcquisitionToCallDownstreamApi(initialScopes)
            .AddMicrosoftGraph(builder.Configuration.GetSection("DownstreamApi"))
            .AddInMemoryTokenCaches();
builder.Services.AddControllersWithViews()
    .AddMicrosoftIdentityUI();

builder.Services.AddAuthorization(options =>
{
    // By default, all incoming requests will be authorized according to the default policy
    options.FallbackPolicy = options.DefaultPolicy;
});

builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor()
    .AddMicrosoftIdentityConsentHandler();

// MudBlazor
builder.Services.AddMudServices();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();

app.UseStaticFiles();

app.UseRouting();

app.MapControllers();
app.MapBlazorHub();
app.MapFallbackToPage("/_Host");

app.Run();