I am using .NET 8 and it is working fine in my local machine. But when I publish it to IIS, Swagger doesn't work. Any help is appreciated.

I've tried almost everything available on internet.

Here is start up - environment setup:

/// <summary>
/// Constructor of the Startup class
/// </summary>
/// <param name="env"></param>
public Startup(IWebHostEnvironment env)
{
     Console.WriteLine("Environment: " + env.EnvironmentName);
     var builder = new ConfigurationBuilder()
         .SetBasePath(env.ContentRootPath)
         .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
         .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true)
         .AddEnvironmentVariables();

     _configuration = builder.Build();
}

Configure service (Swagger configuration):

services.AddSwaggerGen(options =>
{
    options.SwaggerDoc("v1", new OpenApiInfo { Title = "API", Version = "v1" });
    options.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Description = @"JWT Authorization header using the Bearer scheme. \r\n\r\n 
          Enter 'Bearer' [space] and then your token in the text input below.
          \r\n\r\nExample: 'Bearer 12345abcdef'",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.ApiKey,
        Scheme = "Bearer"
    });
    options.AddSecurityRequirement(new OpenApiSecurityRequirement()
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                },
                Scheme = "oauth2",
                Name = "Bearer",
                In = ParameterLocation.Header,
            },
            new List<string>()
        }
    });

    // Add support for XML comments
    var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
    var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
    options.IncludeXmlComments(xmlPath);
});

Configure (Swagger part):

app.UseSwagger();
app.UseSwaggerUI(options =>
{
    options.SwaggerEndpoint("/swagger/v1/swagger.json", "Your API v1");
    options.RoutePrefix = string.Empty;
});