Thunderbolt networking over USB-C requires Thunderbolt 3
Mac systems support networking between two Thunderbolt hosts using a Thunderbolt cable between them. Thunderbolt networking over USB-C requires a host that supports Thunderbolt 3, such as the MacBook Pro (Late 2016) family.
If you're having issues with Thunderbolt networking, or if you were directed to this page when you connected a Mac to another host, check the following:
Verify that your system supports Thunderbolt 3 over USB-C. Check with your system's manufacturer if you think the message was shown in error.
Be sure to connect your Mac directly to the Thunderbolt 3 computer and not through a USB-C hub. USB-C hubs don't support Thunderbolt 3 connections between their ports.
Make sure that the USB-C cable that you're using supports Thunderbolt 3. Not all USB-C cables support the requirements of Thunderbolt 3. For example, a USB-C charge cable doesn't support a Thunderbolt 3 connection.
Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability. Risks are inherent in the use of the Internet. Contact the vendor for additional information. Other company and product names may be trademarks of their respective owners.