Brantside

Hi, I recently moved over to Fuji after years of using Nikon. Bought a Fujifilm X T-2 and have been absolutely delighted with it. Recently tried using it for wildlife shots- digiscoping, with some success. However, although focus peaking is switched on and the camera is in manual mode, I can't get focus peaking to work. It annoying because this is such a great way to get sharp shots when using manual focusing. Any suggestions appreciated.