Not connecting or confirming raid selection

[Marek]

What am I missing? I installed 2 6tb Deskstar Nas drives, I followed the directions for setup but my iMac is not recognizing the drive and I can't seem to get the purple lights to trigger a confirmation. I have the enclosure connected using a USB C to Thunderbolt 2 adapter. Can anyone help?

[Marek]

I've reduced the fault to the USB C to Tb2 adapter. Tried with a C to 3.0 cable today and it booted up and initialized straight away.