Can't pair a battery powered Zigbee device when distant from coordinator

Hello,

I’m trying to associate a Sonoff Zigbee Switch SNZB-01. I can do it when I put it near the coordinator, but when I try to pair it distant from the coordinator it doesn’t work. Obviously, despite it is far from the coordinator, it is near to a lot of routers (2 INNR bulbs, 5 Philips Hue and others).

I already succeded to pair other battery powered Sonoff products, such as SNZB-02 and SNZB-03 without problems.

Here you can see my Zigbee network

Hello, I still have this problem. Do you know how to fix it?