HtmlAgilityPack can't find element

I need to parse a site and I know where to find the element I'm searching: it's a span with class="metadata_with_icon-tags-primary_tag".

My C# code:

var page = new HtmlWeb().Load(url).DocumentNode.Descendants("span").Where(d => d.Attributes.Contains("class") && d.Attributes["class"].Value.Contains("metadata_with_icon-tags-primary_tag"));

Item that I need: