EWS Item теряет загруженное свойство при выполнении кода

Question

Я пытаюсь загрузить и использовать свойства EWS Items. При выполнении моих кодов объект теряет свою ценность. Я загружаю messageId, приложения и тему.

Вот мой код:

'' '

            FindItemsResults<Item> items = EwsHelper.GetMails(credentials);  //Gets the items from the exchange service object. This method populate FindItemResults. It works.

            //Find correct EmailMessage with messageId (mailInput.MessageId is a param to my code to verify that I found the correct mail.
            string messageId = mailInput.MessageId;                             
            //The Id.UniqueId can be found. The property is loaded inside of the "EwsHelper.GetMails".
            foreach (Item item in items.Where(i => i.Id.UniqueId == messageId))
            {
                //Here im loading all the properties I need once again. I can verify that the object does have loaded property through the debugger. Everything is fine!
                item.Load(new PropertySet(ItemSchema.Subject,
                    ItemSchema.Id, ItemSchema.Attachments));
                if (item == null || !(item is EmailMessage))
                    throw new Exception();

                dynamic fileObj = new ExpandoObject();                  
                //Here the item.Subject (which recently was loaded) is null... Cant figure out why?!
                fileObj.Filename = $"{item.Subject.RemoveInvalidFileNameChar()}.msg";
            }

' ''