Cubemaps not applying to textures

[CoconutShell]

Hello,

 

I'm currently retexturing the Nuka Cola machine with substance painter. I'm encountering problems in-game however as cubemaps are not applying to the textures. This makes it so that the parts that are supposed to be metal just become black as you can see here :

 

 

 

Here are my material files as they are the ones that apply the cubemaps :

 

 

 

 

 

 

I've also changed the meshes in a similar way to make them use the default cubemap, but that didn't work either.

 

If anyone is able to help me that would be awesome!