By Niamh Spence & Jessica Gibb The Duchess of Sussex Meghan Markle is thought to have caused annoyance in the Palace after she launched her new luxury brand. Meghan’s new brand American Riviera Orchard ‘soft launched’ in recent weeks and it’s thought the Duchess plans to sell all manner of things from cosmetics to yoga mats and even dog food. Meghan is expected to rake in millions of dollars for her efforts but a royal expert claims this isn’t sitting well with the Palace. Speaking exclusively to the Mirror, royal expert and author Tom Quinn explained: “Like many Americans, Meghan just cannot …