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.
The original Solo10G was built with the Marvel AQ107s, which Apple started supporting with macOS 10.13 (High Sierra)+.
When Marvel discontinued the AQ107s, Sonnet adopted a newer part. Solo10Gs starting with C01248 084 029905 have an AQ113cs. Apple supports the AQ113cs with macOS 12 (Monterey)+.