I have the same issue.
Using a skysphere with a sky material as described in this video allows to work around the issue, and makes the atmosphere appear. However, when trying to launch the game in VR, the engine crashes for me.
I have the same issue.
Using a skysphere with a sky material as described in this video allows to work around the issue, and makes the atmosphere appear. However, when trying to launch the game in VR, the engine crashes for me.