windows server 2019 with 9.0 vGPU software

I’m trying the new windows server 2019 (build 1809…) with the latest nvidia grid drivers.
I run several CLEAN installations but an error always occurs with Hyper-V as soon as I install the 431.02_grid_win10_server2016_server2019_64bit_international.exe , for which I cannot create any new VM (HV complains saying it encountered an error rrying to access an object).

I suspect that the installation screws up something because with the 8.0 version of grid software HyperV is working fine.