Reflections are not shown in my cube environment map (but in camera rendering)

Hello guys,

i like creating environment maps with a cube and a envmap texture … works fine until i used some materials with mirrors … they reflections between the objects show in render view and in the picture taken from the camera … but they dont show in my 6 parted evironment picture … i tried a lot … my cube (camera) uses reflection as coords …didnt solve it…

Please help me, thx in advance