I finally found the solution in this thread:
Basic pairing instructions (except for Leak sensor, Smart Wall Switches, & Smoke Detector):
- Navigate to the Device Discovery page of your hub's web UI and click "Zigbee" to put the hub in ZigBee discovery mode.
- Hold the Xiaomi / Aqara device's reset button until the device's LED flashes 2-3 times, which indicates it has started pairing mode.
- After a brief pause, the LED will flash again:
- 2-3 quick flashes indicates success
- 1 long flash means pairing has not started yet.
- In either case, keep the device "awake" by short-pressing the reset button repeatedly (about every 2-3 seconds, following the same push and LED response sequence described in steps 2-3 above), until the device is recognized by Hubitat.
- If the device does not appear by the end of the ZigBee discovery time period, try again. If pairing continues to fail after 10 minutes of attempts, please see this thread focusing on pairing and keeping Xiaomi / Aqara devices connected .
Step 4 saved me...
