This is currently a known issue (DRG-114306) where the dragon can't be found through the Dragon Roster. However, there is a workaround that lets you place the dragon on your roster. Note that you should have at least 1 empty space on your dragon roster.


For you to be able to activate the dragon, you will need to tap the Dragons Den Building and then "View Dragons"

Dragons Den.png

Once inside, tap the "Swap Dragons" button

Swap Dragon.png

Then tap the "Hunter" on the left side if you aren't guided there and then you should be able to find Vesolance

Vesolance.png