No "Insert device" prompt after launching

I recently completed my first VR game for GearVR, and everything goes well up to the point where I want to launch the game on my phone. The packaging was completed woithout any problems and as far as I know there is nothing deviating from the requirements in the documentation.
When opening the game, the starting position shows up in full screen and it isn’t possible to move the wievpoint by moving the phone. And putting the phone into the headset only starts the oculus app.

I would be really thasnkfull if anyone could help me with this problem as I have no ideawhere to even begin and no one seems to ever mention the same problem.