Additional Home Assistant Connect

Zigbee does not work like that, (you can only have one). Do read ZHA integration documentation first → Zigbee Home Automation - Home Assistant

Then also read Zigbee guides linked in this cookbook → The Home Assistant Cookbook - Index

Especially this one → Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking