We become aware of a problem with our Android 2.12 prod 15 release which prevents new devices from appearing in the Nearby Devices page.
This problem has now been fixed. Please update to 2.12 prod 16 as soon as possible. After updating you may be prompted to allow various Android permissions to be enabled. The permissions must be enabled in order for your Android Casambi app to work correctly.
Please contact Casambi Support if you have further trouble with this.