Setting a bool in behaviour tree.

Im currently making ai for my game. All I want to do Is change a bool value to true within the tree but nothing I’m doing seems to be working.

I made a new task for the blackboard key. Casted to my player blueprint to get the bool value within the task. set the value of my blackboard to bool. set the keyname to the name of the blackboard key. then wired in the casted bool to the blackboard bool and finished the event and ticked it. It doesn’t pick up the change inside the behaviour tree though.
I am getting really confused with this can anyone tell me what I’m doing wrong?