ZHA Add device only works in direct range of Coordintator

Hi,
When adding devices to my ZHA integration, the add only succeeds if the new device can communicate directly with the coordinator.

I notice in the ui an option for “add device via this device” but when I use that option on a router it doesn’t find any devices.

This fails:

Coordinator - Router - New Device

But if I move the new device closer to the coordinator it can be added;

Coordinator - New Device

I’m using a zzh (CC2652R) coordinator and tradfri, bulbs and sockets.

Is it expected that I can add bulbs without having to move them within direct range of the coordinator? Or should I be able to build out from existing routers?

Thanks for any assistance