Thanks presto, but sadly that didnt help. I set up the material exactly like you suggested (well, almost. I tried the vector4, looked kinda weird. Im using a flat normal) and also tried Volumetric Per-Vertex Directional. Still not showing up in the reflections.
Do you have raytracing turned on in your example scene? Because I think thats the problem. The glass material from the doc is not for raytracing, the refraction pin doesnt do anything with RT. I did try the RT Glas from the Automotive Material Collection though. With no luck, the problem persists.
Thank you for your help! 
