Radeon Gpu Affinity not working

i have 2 ‘RX vega 64’ gpu’s in my system
my primary monitor is conected to the primary gpu and 1 1080p monitor is connected to the other.
The probleme is that they both show up under gpu index 0

and when i try to run -gpuformonitor 1 or -gpuformonitor 0 i get the loading screen and the a black window

any ideas?