I don't know much about them. If like tarantulas, try feeding twice a week and take the food out if not eaten after five minutes. If it is hungry enough, I would think it would eat. It looks healthy to me by this photo.
@PhilMcWonder I never use roaches for scorpions, I have tried several kinds for all different species and sizes of scorpions and they struggle to catch them unless they are especially squishy. I imagine dubias being big, shiny and slippery are probably hard to catch unless tweezer fed. Crickets always seem to be much easier