MacBook Air M1 (2020) not recognising ethernet when connected to Anker PowerExpand Elite 13-in-1 Thunderbolt 3 Dock

I am struggling to get my M1 MacBook Air to recognise the ethernet when connected via the dock. I am trying to add it as a connection via Network Preferences. When I add a service, it gives me the option of “Thunderbolt Bridge” under Interface, but when I try to create a new service using that, I just get "Not Connected.

Any ideas how I add it?