Copying the static camera

This is what the manual says about copying a camera position:

Copying the Static Camera from One Scene to Another
If you need to reuse a camera position, you can copy and paste it from one scene to another. It is not necessary
to have the Camera tool selected to perform this operation
To copy the camera position from one scene and paste it into another:

  1. In the Timeline view, select the scene from which you want to copy the Static Camera.
  2. Select Camera> Copy Camera from Selected Panels.

Whenever I try to do this, the menu command is greyed out (inactive), so I can’t copy the camera. It is driving me round the bend, as the program doesn’t give me any clue as to what condition has to be met in order to make this command active! Can anyone help?