A blend specifies what happens when the active camera changes from camera A to camera B. To see the blend in action, make a new camera active. There are a few ways to do this:
Activate incoming vcam’s game object and deactivate outgoing vcam’s game object. You can to this at the same time from a script
Or, set the incoming vcam’s priority to something higher than the outgoing one
Or, give the incoming a higher priority and activate its game object, leaving the other one alone. To transition back, deactivate it.
Note that if no custom blend settings exist for a specific vcam pair, the default blend setting will be used. I mention this because you have set both settings to the same thing.
