No app.UseAuthentication() in webapp with individual identity

[propounder]

Here is the generated code by visual studio:
Even though the app does not have app.UseAuthentication(), it has no problem.

using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using WebAppTest.Data;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

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

var app = builder.Build();

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

app.MapRazorPages();

app.Run();

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Document Details

⚠ Do not edit this section. It is required for learn.microsoft.com ➟ GitHub issue linking.

• ID: 94bfd895-d2af-390b-0801-428b36a27ff4
• Version Independent ID: 0e0d870e-e49a-e16c-c259-68d58e701b8f
• Content: Introduction to Identity on ASP.NET Core
• Content Source: aspnetcore/security/authentication/identity.md
• Product: aspnet-core
• Technology: aspnetcore-security
• GitHub Login: @Rick-Anderson
• Microsoft Alias: riande

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Associated WorkItem - 96054

[Rick-Anderson]

Thanks for reporting this. Code needs to be updated for ASP.NET Core 6 and later.
In ASP.NET Core 6.0 and later, the authentication middleware is automatically enabled by default without explicitly calling UseAuthentication.

[Rick-Anderson]

Dup of #27219