I'm having this same problem.
Attempted to connect Flic2 to Hub and phone for at least an hour now.
Button is blinking red when pressed. Battery was at 88% last time I checked.
I removed if from everywhere it could be paired.
I tried removing and inserting the battery.
...and holding 10s when battery is just inserted to reset.
I tried restarting the Hub and turning BT on phone on/off.
Same behavior from button, no luck on connection.
Now I cannot find any other suggestions out there. What to do??