Unable to access related media in other environments

I have the following code which works fine for getting the media URL of a single image field on my local machine, but when I move the code to our staging environment and create new content, it acts like there is no related image (GetValue returns null):

            var model = new SportsNewsModel NewsItems = new List<SportsNewsItem>() ;
            var topNews = GetDynamicContentItems("Telerik.Sitefinity.DynamicTypes.Model.ClackamasNews.Article")
                .Where(i => i.FieldValue<string[]>("Categories").Contains("2"))
                .OrderByDescending(i => i.GetValue<DateTime?>("ArticleDate"))
                .Take(2);

            foreach (var i in topNews)
           
                var sportsNewsItem = new SportsNewsItem();
                var imageField = i.GetValue<Image>("ArticleImage");

                sportsNewsItem.Headline = i.GetString("Title").ToString();
                sportsNewsItem.NewsPath = i.ItemDefaultUrl;
                sportsNewsItem.PublishDate = i.GetValue<DateTime?>("ArticleDate").Value;
                sportsNewsItem.ImagePath = imageField != null ? imageField.MediaUrl : string.Empty;

                model.NewsItems.Add(sportsNewsItem);
           

            return View("Default", model);