Call Behaviors not working

[EAButNotForGames]

I tried to call an operation in both, an Activity Diagram and a State Machine with Call Behaviors, as described in:
https://sparxsystems.com/enterprise_architect_user_guide/16.1/model_simulation/call_behaviors.html
It doesn't work for neither version 16.1 nor 15.2.

[EAButNotForGames]

Update:
Invoke Behavior of a Class is not functioning, but Invoke Behavior of an Activity is.
So if you want to use an operation in an activity diagram, the operation must be under the activity.