No Matter lock management UI for Aqara U400

Configuration Matter/Thread
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1

I have two Aqara U400 locks which are connected to Home Assistant via an SMLIGHT OTBR. I get no lock management UI on the locks’ device pages even though the get_lock_info action returns the following:

lock.laundry_room_door_lock:
  supports_user_management: true
  supported_credential_types:
    - pin
  max_users: 20
  max_pin_users: 35
  max_rfid_users: null
  max_credentials_per_user: 35
  min_pin_length: 4
  max_pin_length: 8
  min_rfid_length: null
  max_rfid_length: null

Anybody know what’s going on here and how I can fix it?

Thanks.