The C78 hub I just received generates an error message when I connect it to my 2017 21.5 inch Imac. When I check in the System Report under About This Mac it shows “no device connected”. This iMac has
“Two Thunderbolt 3 (USB-C) ports with support for:
Thunderbolt (up to 40 Gbps)
USB 3.1 Gen 2 (up to 10 Gbps)
Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately)”
What is required to solve this?