In order for the LinkZB / LinkPro to function properly with the Inverter, both need to be on the same network and connected to the same access point (mesh node or satellite). If the WiFi credentials are the same for all access points, try moving the EasyLink closer to the Inverter and rebooting it so it connects to the same access point as the Inverter.

Alternatively you can try binding both the inverter and the LinkZB / LinkPro to a single mesh node or creating a different SSID from one of the mesh nodes which is in close proximity to the inverter.