Baby chameleons pull a lot of moisture from the food they eat.
Veileds come from an area that ranges from 4-80 inches of rain a year.
In some areas the only opportunity they have to drink is first thing in the morning.
The ocean helps to blow in moisture for the morning due.
This is what helps make them such a hardy species.
I mist my veileds once a day for 30 seconds and they have a dripper going most of the day.
Some animals need a longer misting session to trigger a "drinking responce".
You could try misting him for a little longer.
He just moved into a new enclosure, so he might be a little stressed from the move.
How long are you misting for?
What type of mister are you using?
-good luck!