Another things can can seriously affect pairing is interference, so regardless of Zigbee solution recommend read and follow → https://community.home-assistant.io/t/guide-for-zigbee-interference-avoidance-and-network-range-coverage-optimization/515752
FYI, Problems with Hue devices not pairing if not been properly reset applies to to all Zigbee gateways, not just ZHA, only meant that ZHA has documeented how to reset → https://www.home-assistant.io/integrations/zha#add-philips-hue-bulbs-that-have-previously-been-added-to-another-bridge