Program.cs

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.Identity.Web;
using Microsoft.Identity.Web.UI;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Mvc.Authorization;
using Graph = Microsoft.Graph;
using TeachersControl.Data;
using TeachersControl.Services;
using TeachersControl;

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();
builder.Services.AddSingleton<WeatherForecastService>();
builder.Services.AddHttpClient();
builder.Services.AddScoped<IUserService, UserService>();
builder.Services.AddScoped<ITeacherDataService, TeacherDataService>();
builder.Services.AddScoped<ISectionService, SectionService>();
builder.Services.AddScoped<IAssignmentService, AssignmentService>();
builder.Services.AddScoped<ApplicationState>();

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.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
    // More here
});
app.MapBlazorHub();
app.MapFallbackToPage("/_Host");

app.Run();