Having the same issue, tried everything, nothing works on my 9700 XT. Just made a post about it actually. There’s a new CVar they added ClientSide_RayTracing or something similar that resets at login to default value of like… BUILD,0x7ffffff,0x0,0x0.
I have a laptop with a NVIDIA card and it works, but now that I think of it, I’ll check if the values are different.
EDIT: That was a bust, no luck, you can find my post/troubleshooting steps here…
Ray Tracing Not Working - Support / Bug Report - World of Warcraft Forums