How to open in the Oculus ?

I created a new Project (Unity 5.6.0), marked in "Edit" - "Project Settings" - "Player" -> "Virtual Reality Supported" and Oculus is on the List.

Then I start the Oculus App (Version 1.11.0.335615) and can look around in the living room. The Option to allow "Unknown sources" is active.

Then I start the Unity App or Player and ... nothing happens, I can see the App running on the Screen, but still the living room in the Oculus.

What is missing ?