Prorender not recognising AMD GFX cards Pro W6800 in Blender.

I have a sporadic issue across different versions of Prorender/blender, when I add in the zip and select prorender on the render setup tab my w6800 does not appear it shows my processor and thats it, Cycles shows and uses W6800 without issue. currently using Blender 4.5.6 Lts and prorender 3.6.10 but this issue has happened odd times for a while and I cannot figure out why? any ideas?