Program.cs

using FluentAssertions.Common;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.EntityFrameworkCore;
using NETCore.MailKit.Infrastructure.Internal;
using RSCAnderlechtF.Data;
using RSCAnderlechtF.Services;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddRoles<IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>();
builder.Services.AddControllersWithViews();

builder.Services.AddTransient<IEmailSender, MailKitEmailSender>();
builder.Services.Configure<MailKitOptions>(options =>
{
    options.Server = builder.Configuration["ExternalProviders:MailKit:SMTP:Address"];
    options.Port = Convert.ToInt32(builder.Configuration["ExternalProviders:MailKit:SMTP:Port"]);
    options.Account = builder.Configuration["ExternalProviders:MailKit:SMTP:Account"];
    options.Password = builder.Configuration["ExternalProviders:MailKit:SMTP:Password"];
    options.SenderEmail = builder.Configuration["ExternalProviders:MailKit:SMTP:SenderEmail"];
    options.SenderName = builder.Configuration["ExternalProviders:MailKit:SMTP:SenderName"];
    options.Security = false; 
});


var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseMigrationsEndPoint();
}
else
{
    app.UseExceptionHandler("/Home/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.UseAuthentication();
app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");
app.MapRazorPages();

app.Run();