如何在.NET HotChocolate中通过自定义ActivityEnricher修改Elastic APM根活动名称？

我尝试通过创建自定义ActivityEnricher并覆写CreateRootActivityName方法，来修改.NET HotChocolate中Elastic APM的根活动名称，代码如下：

public class CustomActivityEnricher : ActivityEnricher
{
    public CustomActivityEnricher(ObjectPool<StringBuilder> stringBuilderPoolPool, InstrumentationOptions options): 
                            base(stringBuilderPoolPool, options)
    {

    }

    protected override string CreateRootActivityName(Activity activity, Activity root, string operationDisplayName)
    {
        return operationDisplayName;
    }
}

按照HotChocolate文档及演示视频的说明，我将其注册为单例服务：

services.AddSingleton<ActivityEnricher, CustomActivityEnricher>();

但该方案并未生效，我得到的是GraphQL服务器的端点，而非正在运行的查询名称。

补充：我的GraphQL服务器配置如下：

services.AddGraphQLServer(schema.Organization.GetGraphId())
                ...
                .AddInstrumentation(o =>
                {
                    o.RenameRootActivity = true;
                    o.IncludeDocument = true;
                });

内容的提问来源于stack exchange，提问作者Y G