Thanks for the clarification about the differences between android and ios estimote apps. The uuid was indeed “B9407F30-1111-466E-AFF9-25556B57FE6D”, but I changed it back to “B9407F30-F5F8-466E-AFF9-25556B57FE6D”.
Following the response of didEnterRegion called multiple times I purged monitoredRegions and rangedRegions lists and app started to respond to different uuids besides the default one.