Turbotax is not recognizing that my son is in college. Where is the option to select that? i marked he attended college/vocational school in 2019 but it doesnt show.

You can mark that your son was a full-time student when you entered him as a dependent. 

1. Login to your TurboTax Account 
2. Click "My Info" from the left side of your screen
3. Click “Edit” next to your  son's name
4. Continue through the questions until "Was X a full-time student in 2019?"