The Starlink Mesh WiFi Router is only compatible with the Standard Actuated and High Performance Starlink Kit and cannot be used to form a mesh network with the Standard (Circular) Starlink or any 3rd party modems, routers, or mesh nodes.
You may use a Starlink Ethernet Adapter to wire connect 3rd party devices to the Starlink Mesh WiFi Router. Starlink Mesh WiFi Router is not compatible for wired connection to other Starlink Mesh WiFi Routers or to the primary Starlink Router