And when the light is flashing are you pressing the button every two seconds?
You should keep the device alive till it is added.
https://homey.app/en-us/app/com.xiaomi-mi/Aqara/
https://community.homey.app/t/howto-find-app-support-topic-or-support-links/68698
Link to Aqara topic https://community.homey.app/t/app-aqara-xiaomi-smart-home-a-different-kind-of-smart-home-solution-zigbee-app/156
