I'm having issues also...Looking forward to a solution!
I also am having little result getting my surge to connect with my new s8. The phone says the surge is rejecting pairing yet the phone does record the steps. It just won't give me phone or text notifications. Haven't tried other bits.
On multiple occasions I've emailed the developer and am given suggestions that don't work. After I tell them they don't work they tell me to buy a new Fitbit.