Have you tried swapping the drive to USB and attempting the configuration that way? Do you have access to any other computers you can do this process on? It only needs to be done once and can be done anywhere.
I’ll be damned, simply using the USB to USB-C vs Thunderbolt 3 cable worked. WHYYYYY??? Don’t worry, I don’t want to really know that answer … it just seems weird that one can’t do this with the T3 cable.
Like you have to know, G-Drive RAID with TB 8 T have only TB access…
And no I don’t have another Mac to proceed… Is it possible to know if G-Technology have problems with Mojave and when a update will be avalaible ? I spend a lot in your products…
Got this exact same issue (and spent about an hour just trying to locate this issue online since there’s almost no info on G Tech’s website about this) and swapping to the USB port instead of Thunderbolt allowed it to be found in Configurator, however, now once I begin the process of configuring the drives, it will crash 100% of the time before or during the execution of the configuration. I’m running High Sierra on a maxed out new iMac Pro and I’m deeply regretting buying this drive instead of a LaCie ATM.