Hello,
On Windows, with the latest AMD drivers (18.3.4), if the Compute mode is enabled, mkxminer is unable to use the GPU (hashrate is 0 and later on the device is reported as SICK).
It works fine with the blockchain driver but I am unable to use that one because of the 8 GPU limit it has.
I think with this miner you need to turn off compute mode. You also need to set core clock high and mem clock low.