Zigbee devices didn't pairing through mesh

The key to a good Zigbee network is to have many “Zigbee Router” devices so uses mesh networking.

You need (several) mains-powered Zigbee devices that act as “Zigbee Router” devices, do read/follow:

https://community.home-assistant.io/t/guide-for-zigbee-interference-avoidance-and-network-range-coverage-optimization/515752