How long have you had it? They do often take a few days to settle in (less disturbance and plenty of foliage help to settle in quicker). Hand feeding is less likely to work than free roaming snacks. If you are really concerned then it's a rare baby cham who isn't excited by fruit flies. Here is a great all-round caresheet I always recommend to Veiled owners - https://www.chameleonforums.com/blogs/chameleonsinmyhouse/395-veiled-chameleon-care-sheet.html