I set this up with my macbook for remote build and successfully deployed a 5.6 project to my iPhone.
Make sure you have installed the binaries for the target IOS platform via the launcher and options on both Windows and Mac. You also can try to verify your 5.6 installation in order to get corrupted or missing files of the engine re-installed. Had isssues myself in the past after updating the 5.4 preview to its final release and could fix that by the verify option.