Program.cs

using Microsoft.EntityFrameworkCore;
using TISOtpApi.Data;

var builder = WebApplication.CreateBuilder(args);

var MyAllowSpecificOrigins = "_myAllowSpecificOrigins";

builder.Services.AddCors(options =>
{
    options.AddPolicy(name: MyAllowSpecificOrigins,
        policy =>
        {
            policy.WithOrigins("http://localhost:4200") // FE origin
                  .AllowAnyHeader()
                  .AllowAnyMethod();
        });
});

// Add services to the container
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddDbContext<OtpDbContext>(opt => opt.UseInMemoryDatabase("OtpDb"));

var app = builder.Build();

app.UseCors(MyAllowSpecificOrigins);

app.UseSwagger();
app.UseSwaggerUI();

app.UseAuthorization();

app.MapControllers();

app.Run();