Cannot add Keyboard Space to currentActionMap

Alright, I have multiple Actionmaps and after switching from one to another I have this code.

Code (CSharp):

1.         #if UNITY_EDITOR
2.             if (PlayerInput.currentActionMap.FindAction("DebugPause") == null)
3.             {
4.                 PlayerInput.currentActionMap.Disable();
5.                 PlayerInput.currentActionMap.AddAction("DebugPause", InputActionType.Button,
6.                         "<Keyboard>/spaceKey").performed += context => Debug.Break();
7.                 PlayerInput.currentActionMap.Enable();
8.             }
9.         #endif

and you guessed it, the Editor doesn't pause, so what am I doing wrong? My guess is, that the "<Keyboard>/spaceKey" isn't the binding it actually needs, but I haven't found anything about this in the Documentation

(the debug.break is just a simplification, the method behind it still doesn't get called)