See → https://www.home-assistant.io/integrations/zha#how-to-add-support-for-new-and-unsupported-devices
1. Try to re-pair/re-join the device several times.
2. Checkout the troubleshooting section.
3. Still not working? You may need a custom device handler. This handler will have exception handling code to work around device-specific issues.
However, before re-pairing them, read and try to follow the best practice tips here → https://community.home-assistant.io/t/zigbee-networks-how-to-guide-for-avoiding-interference-and-optimize-for-getting-better-range-coverage/515752
Some but not all of those tips are also covered in the other sections under troubleshooting in ZHA docs → https://www.home-assistant.io/integrations/zha#troubleshooting