I managed to make them work together. The problem was I moded Rx570 bios so reseting it to stock bios fixed the problem. However stock setting is around 22MH/s for Ethereum  doesnt even worth power consumption.
Anytime I mod the bios for better starps Windows doesnt recognize it.

I used the blockchain driver. what did u exactly do ? I installed vega first then tried 570 first. i tried both on pcie 16 on mobo. no luck.