Could you switch off (remove from power) your Hue bulbs for at least 10 seconds and try again? Please also make sure you are using the latest version of the Hue Essentials app as there were some improvements for Hue Bluetooth, see: Philips Hue Lightstrip Plus not connecting over Bluetooth
Are you able to connect your Hue Bluetooth bulbs to Hue Essentials on your phone?