IHttpContextAccessor.HttpContext is null - .net-core

Question

I'm using DotNet 5.0, and even though I register HttpContextAccessor in the Startup.ConfigureServices whenever I try to reach it inside the code, IHttpContextAccessor.HttpContext is always null.
This is my Startup.cs file's ConfigureServices Method
public void ConfigureServices(IServiceCollection services)
{
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
var environmentName = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
this.Configuration = new ConfigurationBuilder().SetBasePath(System.IO.Directory.GetCurrentDirectory()).AddJsonFile($"appsettings.{environmentName}.json").Build();
services.AddControllers();
services.AddSimpleInjector(container, options =>
{
options.AddAspNetCore();
});
services.AddHttpContextAccessor();
}
And this is the Configure method of the same file:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.UseForwardedHeaders(new ForwardedHeadersOptions
{
ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
});
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
app.UseSimpleInjector(container);
container.Verify();
}
And also I'm using hangfire, but whenever a job gets triggered I cannot reach HttpContextAccessor through dependency injection. It is always null.
For example this is one of my business layer files:
public class FooService
{
private readonly IHttpContextAccessor _httpContextAccessor;
public FooService(IHttpContextAccessor httpContextAcessor)
{
_httpContextAccessor = httpContextAccessor;
}
public DoSomething()
{
var tryoutVar = _httpContextAccessor.HttpContext;
}
}
The tryoutVar variable is set to null, always.
Why is this happening?