Open telemetry .NET I can't make my trace to show under the controller trace

I created this controller

`C#

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    internal static readonly ActivitySource activitySource = new(typeof(WeatherForecastController).Namespace ?? "");
    [HttpGet]
    public async Task<ActionResult> Get()
    {
        var root = Activity.Current;
        root?.SetTag("Test", "TestOpenTelemetry");
        var act = activitySource.CreateActivity("subactivity 1", ActivityKind.Client);
        act?.Start();
        act?.SetTag("Sub", "TestOpenTelemetry Sub");
        return Ok();
    }
}

`

and put this code on my startup

`C# var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
builder.Services.AddOpenTelemetry()
.WithTracing
(x =>
{
   x.AddSource("TesteOpenTelemetry").AddSource(typeof(Program).Namespace + "*").AddSource("*");
   x.SetResourceBuilder(ResourceBuilder.CreateDefault()
   .AddService("TesteOpenTelemetry").AddTelemetrySdk());
   x.AddAspNetCoreInstrumentation(instrumentationOptions =>
 {
     instrumentationOptions.RecordException = true;
 });
 x.AddOtlpExporter(options => options.Endpoint = new Uri("http://127.0.0.1:4317"));
 });
 var app = builder.Build();

 // Configure the HTTP request pipeline.

 app.UseHttpsRedirection();

 app.UseAuthorization();


 app.MapControllers();

 app.Run();`

but when I open the trace on grafana I get just the parent trace

I was expecting to show the parent trace and the child trace inside them

I tried many ways to add the source, just each one, all of them, groups C# x.AddSource("TesteOpenTelemetry").AddSource(typeof(Program).Namespace + "*").AddSource("*");

and nothing seems to work, EF core traces appear, http client traces also work, but my traces don't appear on my grafana

Make sure you call Activity.Stop, otherwise your activity never ends and never gets exported:

var act = activitySource.CreateActivity("subactivity 1", ActivityKind.Client);
act?.Start();
act?.Stop();

Alternatively, make sure the activity is disposed at the end of the scope:

using var act = activitySource.CreateActivity("subactivity 1", ActivityKind.Client);