Windows NVMe-oF Initiator connect error

Hi everyone,
I am trying to test the new Windows NVMe-oF Initiator within build 29550.1000 but I am not able to connect to a remote storage array - getting the error 
"IOCTL_NVMEOF_CONNECT_CONTROLLER failed with error code 0x1f" (see screenshot).
Any idea what does this error mean or what can be wrong?