In some rare circumstances, the Solo10G will not function connected to a particular Thunderbolt port. Try plugging into a different Thunderbolt port on the computer. For example, you must plug into the furthest back Thunderbolt port in an HB Z Book Studio G5.
On the Lenovo Thinkpad P15 (and possibly other Thinkpads), you must set 'DMA Kernel Protection' in the BIOS/UEFI to 'Disable' to allow the Solo10G to function in Windows.